The fastest-growing open-source startups in Q3 2021

Snapshot of ROSS Index featuring top open-source startups by Github stars growth of their repositories. All descriptions below are based on public data and were up-to-date at the end of Q3 2021.
  1. Builder (builderio/mitosis, 2.4K stars, 1593% AGR). Low-code platform for building frontend (headless CMS). Founded in 2018 in San Francisco and raised $3.3M from Greylock, etc.
  2. Earthly (earthly/earthly, 5K stars, 1451% AGR). Build automation system allowing to create Docker images, output artefacts or run tests. Founded in 2020 in San Francisco and raised $2.1M from 468 Capital, Bessemer Venture Partners, Uncorrelated Ventures, etc.
  3. Fig (withfig/autocomplete, 5.9K stars, 811% AGR). Autocomplete for the terminal. Founded in 2020 in San Francisco and raised $2.4M from General Catalyst, SV Angel and YC.
  4. Jina AI (jina-ai/jina, 11.1K stars, 669% AGR). Neural search ecosystem for businesses and developers. Founded in 2020 in Berlin and raised $7.5M from GGV Capital, SAP.io and Yunqi Partners.
  5. OpenReplay (openreplay/openreplay, 2.1K stars, 660% AGR). Open source session replay tool. Founded in 2018 in San Francisco and raised $1.5M from Kima Ventures and YC.
  6. Megaease (megaease/easegress, 3.9K stars, 595% AGR). Cloud service orchestration platform. Founded in 2017 in Beijing and has no known external funding.
  7. Serverless Stack (serverless-stack/serverless-stack, 3K stars, 499% AGR). The developer of SST framework for serverless apps. Founded in 2017 in San Francisco and raised unknown funding from Y Combinator, SV Angel, Greylock, etc.
  8. Modulz (radix-ui/primitives, 1.5K stars, 481% AGR). Code-based tool for designing and prototyping. Founded in 2019 in Dublin and raised $5.4M from LocalGlobe, Frontline, Tiny VC.
  9. Calendso (calendso/calendso, 8K stars, 479% AGR). Scheduling infrastructure (open-source alternative to Calendly). Founded in 2020 in London and has no known external funding.
  10. Coqui (coqui-ai/tts, 2.7K stars, 441% AGR). Speech-to-text and text-to-speech based on deep learning. Founded in 2020 in Berlin and has no known external funding.
  11. Supabase (supabase/supabase, 19.5K stars, 360% AGR). RESTful APIs for PostgreSQL without a single line of code (open-source alternative to Firebase). Founded in 2020 in Singapore and raised $36M from Coatue and Y Combinator.
  12. NocoDB (nocodb/nocodb, 18.3K stars, 359% AGR). No-code database tool (alternative to Airtable). Founded in 2021 in Poole (UK) and has no known external funding.
  13. Typesense (typesense/typesense, 8K stars, 328% AGR). Fast, typo tolerant, fuzzy search engine (open-source alternative to Algolia). Founded in 2016 in Los Angeles and has no known external funding.
  14. Oso (osohq/oso, 1.5K stars, 324% AGR). Framework for authorization. Founded in 2018 in New York and raised $10.9M from Sequoia, SV Angel, Highland Capital Partners, Company Ventures, etc.
  15. Orchest (orchest/orchest, 1.6K stars, 321% AGR). Low-code platform for data pipelines. Founded in 2020 in Rotterdam and raised $3.5M from Gradient Ventures, Basis Set Ventures, Seedcamp, etc.
  16. Ultralytics (ultralytics/yolov5, 16.7K stars, 308% AGR). Low-code computer vision platform. Founded in 2014 in Los Angeles and has no known external funding.
  17. Uniswap Labs (uniswap/v3-core, 1.4K stars, 306% AGR). Decentralised trading Ethereum-based protocol. Founded in 2018 in New York and raised $11M from A16Z, USV, SV Angel and Version One.
  18. Raycast (raycast/script-commands, 2.5K stars, 306% AGR). CLI-based developer productivity tool. Founded in 2020 in London and raised $2.7M from Accel, Chapter One and YC.
  19. Nomic Labs (nomiclabs/hardhat, 1.5K stars, 305% AGR). Platform for development on Ethereum. Founded in 2018 in Buenos Aires and has no known external funding.
  20. SeMI Technologies (semi-technologies/weaviate, 1.8K stars, 299% AGR). ML-based vector search engine. Founded in 2019 in Amsterdam and raised unknown funding from Zetta Venture Partners and ING Ventures

Visit ROSS Index to see the recent top-20 open-source startups.