# Top 10 Open Source Startups in Europe by Funding (2026)

> The 10 best-funded open source startups in Europe, ranked by total funding raised: $824M combined. With founding year, headquarters and each company's rounds.

Source: https://millionrounds.com/top-lists/open-source-startups-europe (Millionrounds; every figure on the page links to its filing or article)

- 1 [**Odoo** Odoo offers an integrated suite of business apps built through an open-source development model.](https://millionrounds.com/company/odoo) Odoo offers an integrated suite of business apps built through an open-source development model. *Founded* 2002 Louvain-la-Neuve, Belgium **$631M** last round Nov 2024
- 2 [**Qdrant** Qdrant is a Berlin-based company that specializes in open-source vector databases and high-performance vector search engines.](https://millionrounds.com/company/qdrant) Qdrant is a Berlin-based company that specializes in open-source vector databases and high-performance vector search engines. *Founded* 2021 Berlin, Germany **$50M** last round Mar 2026
- 3 [**Unleash**](https://millionrounds.com/company/unleash) *Founded* - Norway **$38M** last round Mar 2026
- 4 [**Vates** Vates is a consultancy that specializes in analysis, research products, and risk management.](https://millionrounds.com/company/vates) Vates is a consultancy that specializes in analysis, research products, and risk management. *Founded* 2014 France **$34M** last round Oct 2026
- 5 [**Polars** Polars is an open-source DataFrame library and high-performance data processing solution, founded in 2020 and evolved into Polars Inc.](https://millionrounds.com/company/polars) Polars is an open-source DataFrame library and high-performance data processing solution, founded in 2020 and evolved into Polars Inc. *Founded* 2020 Amsterdam, Netherlands **$21M** last round Sept 2025
- 6 [**Rerun** Rerun is a technology company based in Stockholm, founded in 2022.](https://millionrounds.com/company/rerun) Rerun is a technology company based in Stockholm, founded in 2022. *Founded* 2022 Lillhaerdal, Sweden **$17M** last round Mar 2025
- 7 [**Passbolt** Passbolt is an open-source credential platform based in Luxembourg, designed for security-conscious IT, agile, and DevOps teams.](https://millionrounds.com/company/passbolt) Passbolt is an open-source credential platform based in Luxembourg, designed for security-conscious IT, agile, and DevOps teams. *Founded* 2017 Esch-sur-Alzette, Luxembourg **$12M** last round Jan 2025
- 8 [**Lightdash** Lightdash turns a dbt project into a full-stack BI platform.](https://millionrounds.com/company/lightdash) Lightdash turns a dbt project into a full-stack BI platform. *Founded* 2020 San Francisco, United Kingdom **$11M** last round Oct 2024
- 9 [**Syntasso** Syntasso are the creators of Kratix, the open-source framework for building platforms: https://kratix.io/](https://millionrounds.com/company/syntasso) Syntasso are the creators of Kratix, the open-source framework for building platforms: https://kratix.io/ *Founded* 2021 Fleet, United Kingdom **$8.6M** last round Jul 2023
- 10 [**Vizor.io** Vizor is a platform for creating & sharing VR on the web.](https://millionrounds.com/company/vizor-io) Vizor is a platform for creating & sharing VR on the web. *Founded* 2015 Helsinki, Finland **$2.3M** last round Apr 2017

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies whose funding rounds we classed as this sector, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

## Who backed them?

Open any company for its rounds and investors, or search the investors who back open source startups in Europe in the app, with filters, lists and exports.

[Find their investors](https://millionrounds.com/login?join=1&next=/app/investors)[All top lists](https://millionrounds.com/top-lists)

## More open source lists

[See all](https://millionrounds.com/top-lists?t=Open%20source)

[*RA* *TA* *T* **Open source startups worldwide** 50 companies · $9.8B](https://millionrounds.com/top-lists/open-source-startups)

## More lists for Europe

[See all](https://millionrounds.com/top-lists?r=Europe)

[*IL* *O* *NH* **Health startups in Europe** 3,025 companies · $29B](https://millionrounds.com/top-lists/health-startups-europe)[*IL* *NH* *CS* **Biotech startups in Europe** 1,665 companies · $22B](https://millionrounds.com/top-lists/biotech-startups-europe)[*MA* *N* *NG* **Big data startups in Europe** 964 companies · $31B](https://millionrounds.com/top-lists/big-data-startups-europe)[*V* *S* *CG* **Energy providers startups in Europe** 953 companies · $41B](https://millionrounds.com/top-lists/energy-providers-startups-europe)[*S* *EP* *S* **Climate tech startups in Europe** 756 companies · $25B](https://millionrounds.com/top-lists/climate-tech-startups-europe)[*S* *K* *FC* **Fintech startups in Europe** 749 companies · $30B](https://millionrounds.com/top-lists/fintech-startups-europe)[*A* *CI* *Y* **Customer service startups in Europe** 720 companies · $13B](https://millionrounds.com/top-lists/customer-service-startups-europe)[*N* *W* *T* **Transport startups in Europe** 697 companies · $28B](https://millionrounds.com/top-lists/transport-startups-europe)