
THE RISING STARS of OPEN SOURCE 2023
The Open Source projects with most traction and promise in 2023
Published in 2023
Introduction to the Rising Stars
Open Source companies operate in a unique ecosystem characterised by open collaboration, community involvement, and diverse revenue models. The open source approach to software development and business differs from companies that rely on proprietary software licensing models, and therefore working with such companies presents a unique challenge. These businesses often commercialise only when a product is more mature, already has significant user adoption and traction from an open source community of contributors and users.
So, as an investor, is it possible to evaluate the pre-financial traction of these open source software projects? How can one measure the activity of a community – the leading indicator of the explosive growth that open source projects can achieve?
Each year, Oxx analyses the open source landscape, to identify which businesses in the open source ecosystem show signs of becoming successful, sustainable companies. We have developed a methodology that combines both awareness and engagement metrics for open source projects and allows us to identify high-potential projects before they reach significant scale. We look at “ProductCommunity Fit”, measuring the active contributor base of a project as an indicator of engagement and future fundraising potential, resulting in our mapping of the “Rising Stars of OpenSource”. Since we first ran this analysis in 2021, the companies identified have raised >$1.5bn of venture capital.
Highlights

37
companies

4-5
minted unicorns & several “soonicorns”

>$1.5bn
in raised capital
Succeeding in Open Source: Finding Product Community Fit
Entrepreneurs and investors will be familiar with the concepts of Product Market Fit (PMF), and more recently, Go-to-Market Fit (GTMF). However, because open source companies often reach significant levels of product maturity before commercialising, they can achieve strong product market fit with fewer outward signs of GTMF. So how can we measure the latent potential for GTMF in these pre-commercial (or early commercial)projects?
Successful open source companies excel in building strong communities, providing value-added services, and striking a balance between “building in the open” and “revenue generation and moat”. So for open source companies, we are suggesting a new leading indicator of commercial potential based on the activity of its community: this is the concept ofProduct Community Fit (PCF).
Product Community Fit is all about the harmony between a product and the people who use it, contribute to it, and shape its evolution. Think of it as a close connection between a product and its community of users and contributors. For open source projects, this community is often the market itself. The key here is that the open source project develops in a way that aligns seamlessly with what the community and therefore potential customers need and desire.
One way we gauge Product Community Fit is by measuring the growth in a project’s active contributor base. This metric tells us how engaged the community is in actively developing and moulding the product, and how quickly that community is growing. More active involvement suggests a stronger fit. On platforms like GitHub, activities such as code commits and addressing issues demonstrate that people aren’t just casual observers of a repo; they are genuinely invested in the project’s growth.
Why is this so important? Well, Product Community Fit serves as a leading indicator of future success. An active and committed community not only spreads awareness but also provides valuable feedback, helps fix bugs, and contributes new features. This support is invaluable and paves the way for commercialisation and fundraising. In essence, the community is a prerequisite to success in open source, and Product Community Fit isa more predictive metric of open source longevity because it captures the essence of market and community alignment.
When we focus on Product CommunityFit, we can identify projects with momentum. This momentum not only highlights their present success in engaging a community but at certain levels can be a good indicator of future commercial viability.
Levels of engagement: Understanding the GitHub metrics
How can you tell if a company hasachieved Product Community FIt?Oxx’s methodology is based on ananalysis of public repositoryinformation from Github. As theleading platform for version control,collaboration, and hosting for opensource software repositories, allowingdevelopers to work together on codeprojects, Github’s public data
archives and APIs are a great source of open source data. The platform provides several engagement metrics that can help users gauge the activity and popularity of repositories and projects. These metrics are intended to give insight into how active and well-received a repository is within the GitHub community, and provide a high level view of a project’s traction:
| Stars | A way for users to favourite and show their appreciation or interest in a project. |
| Forks | Copies of a project. Contributors can make changes without affecting the original. |
| Watchers | Watchers receive notifications when there are new commits, issues, or pull requests. |
| Downloads | Measure the number of times a specific file or asset has been downloaded. |
| Issues | A way for users to report problems or suggest improvements. |
| Pull requests | Used for proposing changes to a project. Go through a review and approval process. |
| Commit | An individual change to a file (or set of files) within a project. |
When evaluating a company forProduct Community Fit there are multiple layers to look at, and it’s essential to distinguish between top-level metrics and more meaningful indicators that provide a clearer picture of a project’s health and potential. Put simply, some metrics measure awareness, and others active engagement. It is the active engagement that is relevant when evaluating Product Community Fit.
There are limitations of certain commonly used higher level metrics, which are outlined below.
Stars
While the number of stars a GitHub project receives may initially seem like a positive sign, it’s important to note that stars primarily reflect initial interest or awareness rather than active engagement. Projects can accumulate many stars but still have limited community contribution. Additionally, stars can be artificially inflated, making them unreliable as a measure of genuine community interest.
Forks
The number of forks indicates copies or duplicates of a codebase, but it does not necessarily signify active development or genuine community engagement. Forks can happen for various reasons, including experimentation or minor adjustments, without substantial contributions to the project’s advancement.
Watchers
Watchers are individuals who choose to follow project updates. However, this is more a form of passive observation rather than active participation. A project can have a significant number of watchers who might not be actively using or contributing to it, making this metric less informative about the depth of community engagement.
Downloads
Download statistics demonstrate adoption of a project, but they do not necessarily reflect how much the community is actively shaping or evolving the product. A high number of downloads may indicate interest, but it doesn’t provide insights into whether the project aligns with users’ needs or if the community actively contributes to its development.
The top level metrics described earlier can be misleading for several reasons.They are susceptible to manipulation and may not accurately represent the true level of community engagement or the project’s fit within its user base. Moreover, these metrics are often lagging indicators, taking time to accumulate even when there’s a lack of real engagement. They are quantitative in nature and do not capture the qualitative aspects of the community’s motivation and commitment. So while these top-level metrics may offer a superficial impression of a project’s popularity, they do not reliably indicate its actual adoption, fit with user needs, or the depth of community involvement.
To assess Product Community Fit effectively, it is necessary to look beyond these metrics and focus on more meaningful indicators that reflect active participation, collaboration, and alignment between the project and its community. Oxx does this by leveraging GitHub’s public events database to analyse contributor activities, including commits, issues, comments, and pull requests. This approach, which focuses on “monthly active contributors” – users actively involved in committing code, raising issues, commenting on discussions, or making pull requests within the past month, offers a more refined measure of monthly engagement while effectively filtering out inactive or casual users.
By emphasising direct contributions and qualitative commitment, this metric not only resists manipulation but also better reflects the community’s motivation, buy-in, and its potential to drive adoption and shape the project’s future. Tracking monthly active contributors based on contribution activities provides a more predictive and dependable measure of open source community engagement and fit.
Key takeaway: Contributors
A contributor, as defined by Oxx, is a user who has either:
- Created a GitHub issue
- OR added an issue comment
- OR logged a pull request
- OR has added a commit
The GitHub public events database
The GitHub public events database is a comprehensive record of activity and events occurring within public GitHub repositories. This database includes a wide range of events associated with open source projects, such as pushes, issues, comments, and pull requests. These events are continuously captured in real-time and are made accessible through a public API. The data is freely available for analysis.Importantly, this database stores historical data dating back several years, allowing for the examination of activity trends over time. Users can access the raw data either through the API or by accessing historical data via BigQuery. GitHub’s documentation provides detailed information about the types of events tracked and the specific information contained within each event.
Methodology
Having backtested our methodology for measuring open source traction on over 175,000 projects, over 15 years of historical engagement data, we have developed a clear view on the leading indicators of open source growth with the concept of Product Community Fit. Historical data shows that projects with accelerating engagement levels, entering the 50-100 active creators“zone” would have the best potential to commercialise successfully, and to continue to scale.
Identifying the rising stars of open source involves analysis of second order GitHub data (as described earlier), to assess activity and engagement over time. Using theGitHub API, we enrich the Github Archive data with additional details such as repository descriptions, programming languages, locations of contributors etc.
The enriched repository data is subsequently used to filter and analyse projects based on predefined Product Community Fit criteria, such as having 20 to 200monthly active contributors, showing rapid month-over-month growth, and exhibiting other engagement signals and metrics. Projects are monitored over time to identify trends in surging engagement and trajectory. Once the analysis is concluded, we select the annual emerging stars cohort.
This approach forms the core of the data-driven approach to open source discovery.
| # Active Contributors | Description |
| 20-50 | Early signals of Product Community Fit |
| 51-100 | Strong emerging Product Community Fit |
| 101-200 | Great product, market, community fit |
| 201+ | Scale |
Evaluating the 2021-22 cohorts: Where are they now?
Since 2021, we have conducted an annual analysis of open source projects and released our findings on the “rising stars” each year: the projects at early stages of commercialisation with the highest levels of open source community traction. So, what has happened to the previous cohorts of identified rising stars?
In aggregate, the 2021 and 2022 cohorts have raised more than $1.5bn in venture capital, and have produced a number of unicorn companies. Several are also “soonicorns”, that is, well on their way to achieve unicorn valuations.
Mapping the capital raised by the companies in the 2021-2022 cohorts, the data shows that our methodology has highlighted several open source projects poised for growth and investment. A handful have gone further and emerged as global high-flyers with over $100m raised.
“It has been fantastic to see the success of the 2021 and 2022 cohorts in the capital markets.This success is proving out two of our foundational beliefs about open source: (a) that open source is a fantastic basis for building enterprise software and (b) that community engagement – product community fit – is a great measure for understanding early traction in great projects.”
Bob Thomas, Partner, Oxx

The 2021 cohort
- 21 companies identified
- Raised >$1 billion in venture capital since being identified.
- 86% of companies raised >$5m
- Includes 1 “soonicorn”
- and 4likely unicorns
- 1 company was acquired – Fig acquired by AWS.
The 2022 cohort
- 16 companies identified
- Raised over $500 million despite challenging capital markets.
- 76% of companies raised over $5 million.
- Includes some breakout “growth” stage companies.


N.b. the categorisation is based on Oxx estimates, based on growth capital raised.
The companies of the 2021 cohort
| PROJECT | URL | ABOUT |
|---|---|---|
| Airbyte | https://airbyte.io | Airbyte is a data integration platform that helps to replicate data inwarehouses, lakes and databases. |
| Appsmith | https://www.appsmith.com | Appsmith helps developers quickly build any custom business softwarewith pre-built UI widgets that connect to any data source. |
| Appwrite | https://appwrite.io | Appwrite is a secure backend server for web, mobile and Flutterdevelopers. |
| Botpress | https://botpress.com | Botpress gives developers the building blocks to build advancedchatbots. |
| Budibase | https://budibase.com | Budibase is a low-code platform for building business apps in minutes. |
| Cal | https://cal.com | Cal is the Open Source Calendly alternative, offering schedulinginfrastructure with flexible workflow and appearance. |
| Deepset | https://www.deepset.ai/haystack | Deepset is a composable neural search framework, allowing developersto build and scale a question answering system that transforms search. |
| Fig | https://fig.io | Fig adds VSCode-style autocomplete to your existing terminal. |
| Gravitee.io | https://www.gravitee.io | Gravitee.io is the richest Open Source solution for building, managingand monitoring your entire API ecosystem quickly in one place. |
| Jina AI | https://jina.ai | Jina AI helps companies create neural search applications in minutes. |
| Kubermatic | https://www.kubermatic.com | Kubermatic allows developers to automate the operations of thousandsof clusters across multi-cloud, on-prem, and edge environments. |
| Modulz | https://www.modulz.app | Modulz is a code-based design tool for designing and prototyping withreal components. |
| Nebula Graph | https://nebula-graph.io | Nebula Graph from Vesoft is a graph database built for super large-scale graphs with milliseconds of latency. |
| NocoDB | https://nocodb.com | NocoDB is the Open Source Airtable alternative, a no code platform thatturns any database into a smart spreadsheet. |
| Ory | https://www.ory.sh | Ory is an identity platform built for scale indefinitely and based entirelyon Open Source. |
| QuestDB | https://questdb.io | QuestDB aims to be the fastest Open Source time series database. |
| Supabase | https://supabase.com | Supabase is the Open Source Firebase alternative, allowing developersto create a backend in minutes. |
| Tailscale | https://tailscale.com | Tailscale is a corporate VPN that installs on any device in minutes,manages firewall rules for you, and works from anywhere. |
| Tauri | https://tauri.studio/en/ | Tauri helps develpers build smaller, faster, and more secure desktopapplications with a web frontend. |
| Teleport | https://goteleport.com | Teleport allows engineers and others to unify access for SSH servers,Kubernetes clusters, web apps, and databases across all environments. |
| Temporal | https://temporal.io | Temporal is a microservice orchestration platform for writing durableworkflows as code. |
The companies of the 2022 cohort
| PROJECT | URL | ABOUT |
|---|---|---|
| DuckDB | https://duckdb.org/ | DuckDB is a high-performance analytical database system. It is designed to be fast, reliable and easy to use. |
| Infracost | https://www.infracost.io/ | Cloud cost estimates for Terraform in pull requests |
| Kubecost | https://www.kubecost.com/ | Real-time cost visibility and insights for teams using Kubernetes. |
| Meltano | https://meltano.com/ | Open-source DataOps platform to manage all the data tools in your stack in one place |
| MindsDB Inc | http://mindsdb.com/ | Open-source, in-SQL machine learning |
| Nhost | https://nhost.io/ | Open-source Firebase alternative with GraphQL |
| Novu | https://novu.co | Open-source notification infrastructure for products |
| Pipedream | https://pipedream.com/ | The integration platform built for developers |
| Qwik | https://qwik.builder.io/ | The HTML-first framework — instant apps of any size with ~1kb JS |
| Redpanda | https://redpanda.com/ | Streaming data platform for developers |
| RisingWave Labs | https://www.risingwave.dev/ | Next-generation streaming database in the cloud |
| Semgrep | https://r2c.dev/ | Modern static analysis tools built for CI/CD |
| StarRocks | https://starrocks.com/ |
Spotlight: Standouts from 2021 & 2022
Airbyte
Airbyte is the open-source data movement leader running in the safety of your cloud and syncing data from applications, APIs, and databases to data warehouses, lakes, and other destinations. Airbyte makes moving data easy and affordable across almost any source and destination, helping enterprises provide their users with access to the right data for analysis and decision-making.
The company has the largest data engineering contributor community – with more than 800 contributors – and the best tooling to build and maintain connectors.
In 2023, they launched a no-code connector builder that in three months allowed its community to build more than 1,500 connectors for their own needs.
Gravitee
Gravitee is the first-ever event-native API Management solution that enables organisations to govern, manage and secure APIs and Event Streams. With native support for synchronous RESTAPIs, asynchronous APIs, and event brokers like Kafka and MQTT, the Gravitee platform helps organisations manage and secure their entire API lifecycle with solutions for API design, management, security, productisation, real-time observability, and more.
Since being named an Oxx Rising Star in 2021, Gravitee has raised a Series B allowing for global expansion, improved customer support and a significant investment in the platform roadmap. Gravitee was recognised as a Gartner Visionary in the 2023 API Management Magic Quadrant and a Leader by G2.
Redpanda
Redpanda is a simple, powerful, and cost-efficient streaming data platform that is compatible with- but eliminates the complexity of Kafka® APIs (a popular open source streaming project). In essence, the company helps companies capture data in realtime in a modern context, providing anew way to stream data while maintaining backwards compatibility with Kafka.
Since being named an Oxx Rising Starin 2021, Redpanda has raised both a Series B and C, and will use the latest capital infusion to expand in three areas, including go-to-market, scaling to meet the needs of larger customers and customer support.
DuckDB
DuckDB is a high-performanceanalytical database system. It isdesigned to be fast, reliable, portable,and easy to use. DuckDB provides arich SQL dialect, with support farbeyond basic SQL. DuckDB supportsarbitrary and nested correlatedsubqueries, window functions,collations, complex types (arrays,structs), and more. Based on theplatform, in 2022 MotherDuck wasfounded.
MotherDuck provides a cloud analyticsservice based on DuckDB. It is aventure-backed company creating ahybrid cloud/local platform usingDuckDB. MotherDuck contracts withDuckDB Labs for developmentservices, and DuckDB Labs owns aportion of MotherDuck.
In September 2023, MotherDuckannounced a $52.5m Series B round.
The emergence of AI influencers
One of the standout trends in the open-source landscape for 2023 is the rise of AI technologies globally. Significant developments in generative technology, LLMs and agents has led to high adoptability for bleeding-edge projects that experiment with these technologies, and in turn, the rise of“AI influencers” on GitHub. Figures likeHarrison Chase and Georgi Gerganov, among many others, have started projects which garnered massive traction within the GitHub ecosystem, (Langchain as one example, experiencing a staggering growth rate of over 6000% in engagement over just six months, and becoming the defacto agent standard for AI applications). This remarkable surge in popularity underscores the significant impact AI-powered developer personalities can have within a very short space of time.
The surge in creator engagement around these AI influencers serves asa compelling indicator that this trend isnot only noteworthy but also indicative of the shifting dynamics in the open-source world. As AI technology continues to advance, its capacity to generate code and engage meaningfully in open source communities is rapidly improving. AI influencers are developing projects towards a potential future in which AI developers collaborate seamlessly with human counterparts in open source endeavours – MetaGPT, AutoGPT and others have been early movements in this domain.
The companies of the 2023 cohort
| PROJECT | URL | ABOUT |
|---|---|---|
| Astro | https://astro.build/ | Builds websites using server-side templating that renders directly to HTML & CSS, eliminating heavy JavaScript automatically. |
| Bun | https://bun.sh/ | The incredibly fast JavaScript runtime, bundler, transpiler and package manager. |
| Cursor | https://cursor.sh/ | The AI-powered code editor. |
| Dify (LangGenius) | https://dify.ai/ | Seamlessly build & manage AI-native apps based on GPT-4. |
| DragonflyDB | https://www.dragonflydb.io/ | A drop-in Redis replacement that is optimised for data-intensive, low-latency applications. |
| Flower | https://flower.dev/ | A Friendly Federated Learning Framework. |
| FlowiseAI | https://flowiseai.com/ | Open-source UI visual tool to build your customised LLM flow using LangChainJS, written in Node TypeScript/JavaScript. |
| Invoke AI | https://invoke.ai/ | Streamlining creative workflows for artists, designers, marketers and more. |
| Ivy | https://unify.ai/ | Brings best-in-class frameworks, infrastructure and hardware directly to you — with one line of code. |
| Nomic | https://atlas.nomic.ai/ | Interact, discover insights and b |
Summary
We have high hopes for the 2023 cohort as they bring a new generation of fundamental technologies to market.They target thematically relevant areas for 2023 particularly, as we see the paradigm shift in database development, applications and AI tooling.
While the 2023 capital markets outlook might present a tougher backdrop for financing, the quality of products, community engagement levels and
attractiveness of end-markets should give these companies the edge over others when it comes to growth. Their open source foundations also provide the opportunity to attract and recruit the most talented developers –interested in solving some of the biggest problems in B2B software today – to their cause. We’re already looking forward to 2024 and updating you on their progress!
About the author

Bob Thomas
Bob is a Partner at Oxx, based in Stockholm. He joined Oxx in 2018 and has been integral in building out our people-first philosophy and specialist SaaS investment focus. Bob is both a finance industry veteran and has an operator background as a CFO. He works closely with Oxx’s portfolio companies to scale their organisations, introduce talent and customers, and develop investor relationships. As a computer science, cybersecurity, and data enthusiast, he leads the data development initiatives within Oxx and is an open source software advocate.
For inquiries about methodology and analysis, reach out to Bob at bt@oxx.vc.

Disclaimer
The contents of this report are for informational purposes only. Such information contained herein are the author’s alone and are not intended to constitute an offer, solicitation, recommendation or advice to purchase any security or any investment product or service. The information should not be relied upon for legal, accounting or tax advice or investment recommendations. Any reproduction or distribution of the information in this report, in whole or in part, or the disclosure of its contents to any person other than to a professional adviser is prohibited without the prior written consent of Oxx Ltd. Accordingly, no representation or warranty, express or implied, is made as to, and no reliance should be placed on, the fairness, accuracy, timeliness, or completeness of this information. Oxx Ltd and all employers and their affiliated persons assume no liability for this information. Such information, opinions and images are subject to change and Oxx Ltd has no obligation to update the information contained in this report. Readers should make their own determination as to whether a particular investment opportunity is suitable for their investment needs or should seek such professional advice before making any investment decision.

