Top trending open-source startups in Q2 2025

Snapshot of ROSS Index featuring top open-source startups by GitHub stars growth of their repositories. All descriptions are based on public data and were current as of the end of Q2 2025
  1. 🇺🇸 Union Labs (unionlabs/union, 54.2K stars, 54.2x growth) is a modular zero-knowledge interoperability layer linking blockchains. Founded in 2023 in Dover, DE. Raised $16M from Semantic, Tioga, Galileo, Nascent, LongHash, gCC, etc.
  2. 🇺🇸 Linera (linera-io/linera-protocol, 21.2K stars, 14.6x growth) develops a blockchain protocol for highly scalable, low-latency Web3 applications. Founded in 2021 in San Francisco. Raised $12M from Andreessen Horowitz, Borderless, Tribe, etc.
  3. 🇺🇸 Sesame (sesameailabs/csm, 13.4K stars, 13.4x growth) designs voice-first AI eyewear and a companion assistant. Founded in 2022 in San Francisco. Raised $57.6M from Andreessen Horowitz, BIG, Matrix, Spark, etc.
  4. 🇸🇬 Mindverse (mindverse/second-me, 12.8K stars, 12.8x growth) develops SecondMe, a locally run AI doppelganger that keeps all your data private. Founded in 2022 in Singapore. Raised $29.9M from Square Peg, Hongshan, K2VC, Linear, Plug and Play Tech Center, HSG.
  5. 🇨🇭 Browser Use (browser-use/web-ui, 11.5K stars, 11.5x growth) is a toolkit that lets AI agents control a browser, automating end-to-end web workflows. Founded in 2024 in Zurich. Raised $17.5M from Y Combinator, Felicis, SV Angel, Pioneer, Nexus, Liquid 2, A.Capital etc.
  6. 🇺🇸 Prefect (jlowin/fastmcp, 10.6K stars, 10.2x growth) built Python workflow orchestration. Now developing FastMCP 2.0, a Pythonic toolkit to build MCP servers for tool-enabled LLMs. Founded in 2018 in Washington, DC. Raised $60M from Positive Sum, Atreides, Operator, Bessemer, Quiet, Tiger.
  7. 🇺🇸 Mastra (mastra-ai/mastra, 11.8K stars, 9.9x growth) provides a TypeScript agent framework with cloud workflows and observability. Founded in 2024 in San Francisco. Raised $0.5M from Y Combinator, Pioneer, SAV, Orange Collective, etc.
  8. 🇸🇬 DUIX (duixcom/duix.heygem, 9.7K stars, 9.7x growth) provides a digital-human SDK for real-time interactions. Founded in 2017 in Singapore.
  9. 🇫🇷 Lightpanda (lightpanda-io/browser, 8.2K stars, 8.2x growth) is a Zig-built headless browser optimized for AI automation. Founded in 2022 in Paris. Raised an undisclosed amount from Agoranov, ISAI, Prototype, etc.
  10. 🇺🇸 Oumi (oumi-ai/oumi, 8.1K stars, 8.1x growth) builds open-source frontier AI models through a global community. Founded in 2024 in Seattle, WA. Raised $10M from Plug and Play, Ascend, Obvious, Venrock, etc.
  11. 🇨🇳 Cherry Studio (cherryhq/cherry-studio, 21.6K stars, 7.9x growth) is a desktop chat app that supports multiple LLM providers. Founded in 2021 in Shanghai, China.
  12. 🇺🇸 LangChain (langchain-ai/local-deep-researcher, 7.2K stars, 7.2x growth) builds a full-stack agent toolkit. Founded in 2022 in San Francisco. Raised $35M from Benchmark, Sequoia, Conviction Partners, Lux, Abstract, etc.
  13. 🇺🇸 Zyphra (zyphra/zonos, 6.6K stars, 6.6x growth) develops leading open-weight text-to-speech models. Founded in 2021 in Palo Alto, SF. Raised an undisclosed amount from Defined, BC, Bison, Future, Gaia, etc.
  14. 🇸🇬 Leopard Labs (nanobrowser/nanobrowser, 6.3K stars, 6.3x growth) builds Nanobrowser, an AI web automation tool that runs in your browser. Founded in 2024 in Singapore.
  15. 🇺🇸 Crestal (crestalnetwork/intentkit, 6.2K stars, 6.2x growth) develops IntentKit, an autonomous agent framework. Founded in 2024 in San Francisco. Raised $2M from Veris, SMAPE, Quotient, Pragma, NxGen, MH, LIF, Builder, etc.
  16. 🇮🇳 RagaAI (raga-ai-hub/ragaai-catalyst, 15.7K stars, 6.1x growth) offers Catalyst, a GenAI management and optimization platform. Founded in 2021 in India. Raised $4.7M from Pravega, Pi, Arka Labs, TenOneTen, Exfinity, Anorak, Mana, etc..
  17. 🇺🇸 Zero (mail-0/zero, 6.0K stars, 6.0x growth) is an open-source, privacy-first email client. Founded in 2025 in San Francisco. Raised $0.5M from Y Combinator.
  18. 🇺🇸 Pangolin (fosrl/pangolin, 5.7K stars, 5.7x growth) is a self-hosted WireGuard-tunneled reverse proxy. Founded in 2024 in the United States. Raised $0.5M from Y Combinator.
  19. 🇺🇸 Firecrawl (nickscamara/open-deep-research, 5.5K stars, 5.5x growth) turns websites into clean, LLM‑ready data with fast crawling and AI‑powered extraction. Founded in 2022 in San Francisco. Raised an undisclosed amount from Y Combinator.
  20. 🇺🇸 LastMile AI (lastmile-ai/mcp-agent, 5.5K stars, 5.5x growth) helps debug, evaluate and monitor generative-AI applications. Founded in 2023 in New York. Raised $10M from Gradient, Firsthand, Exceptional Capital, AME Cloud, 10x Founders, etc.

Anyone with a featuring on ROSS Index Q2 2025 can add the badge to their own website to let site visitors know they are one of the fastest-growing open-source startups.

Visit ROSS Index to see the top-20 open-source startups in other quarters.