Top trending open-source startups in Q3 2026

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 Q3 2026
  1. 🇺🇸 OpenDesign (nexu-io/open-design, 98.7K stars, 81.7x growth) builds Open Design, a desktop AI agent that prototypes websites, mobile apps, and slides. Founded in 2024 in San Jose, CA. Raised an undisclosed amount from GSR, Hillhouse, MindWorks, ClassIn.
  2. 🇺🇸 Graphify (Graphify-Labs/graphify, 122.5K stars, 78.2x growth) turns codebases, docs, and diagrams into queryable knowledge graphs for AI coding assistants. Founded in 2026 in San Francisco. Raised $0.5M from Y Combinator.
  3. 🇺🇸 Headroom (headroomlabs-ai/headroom, 74.1K stars, 51.4x growth) compresses tool outputs, logs, and RAG data to cut LLM token costs. Founded in 2026 in Fremont, CA.
  4. 🇦🇪 Multica (multica-ai/multica, 51.7K stars, 38.6x growth) is a platform for assigning tasks to AI coding agents and tracking their progress. Founded in 2025 in Dubai.
  5. 🇺🇸 TinyHumans (tinyhumansai/openhuman, 40.2K stars, 36.1x growth) builds OpenHuman, a local-first desktop AI agent with persistent memory across 100+ connected services. Founded in 2025 in San Francisco.
  6. 🇺🇸 HeyGen (heygen-com/hyperframes, 54.3K stars, 35.5x growth) is an AI avatar video platform and the creator of HyperFrames, an HTML-to-video rendering engine for agents. Founded in 2020 in Los Angeles. Raised $69M from Benchmark, Thrive, Bond, Conviction, SV Angel, etc.
  7. 🇹🇷 Herdr (herdrdev/herdr, 41.5K stars, 29.1x growth) is a terminal runtime that keeps AI coding agents running in the background and lets you manage them across machines. Founded in 2026 in Ankara. Raised $6M from Bessemer, Y Combinator, e2vc, Tobi Lutke, Dane Knecht, Gorkem Yurtseven.
  8. CloakBrowser (CloakHQ/CloakBrowser, 31.8K stars, 25.6x growth) builds CloakBrowser, a stealth Chromium fork that lets scrapers and browser agents bypass bot detection. Founded in 2026.
  9. 🇺🇸 Firecrawl (firecrawl/anydoc, 22.3K stars, 22.3x growth) is a web data API for AI agents and the creator of anydoc, a Rust document-to-Markdown converter, and pdf-inspector, a Rust library for PDF inspection and text extraction. Founded in 2022 in San Francisco. Raised $91.2M from Smash, Nexus, Altos, Y Combinator, Freestyle, Offline, Zapier, etc.
  10. 🇺🇸 Prime Intellect (PrimeIntellect-ai/prime-agent, 21.4K stars, 21.4x growth) is a compute and RL training platform and the developer of Prime Agent, a self-improving coding agent. Founded in 2024 in San Francisco. Raised $150.5M from Radical, Founders Fund, CoinFund, Distributed Global, NVentures, Intel, Dell Technologies, etc.
  11. 🇺🇸 Stably AI (stablyai/orca, 81.6K stars, 19.0x growth) builds Orca, a terminal-based environment for running and orchestrating dozens of coding agents at once. Founded in 2022 in San Francisco. Raised $0.5M from Y Combinator.
  12. 🇭🇰 Hypit AI (hypit-ai/hypit, 17.5K stars, 17.5x growth) lets AI agents clone viral videos and generate variants at scale. Founded in 2026 in Hong Kong.
  13. 🇺🇸 Citro Labs (citrolabs/ego-lite, 16.7K stars, 16.7x growth) builds ego, a cross-device personal AI agent, and ego lite, a browser where AI agents run web automation in parallel with the user. Founded in 2024 in San Francisco.
  14. 🇺🇸 iFixAi (ifixai-ai/iFixAi, 16.7K stars, 16.7x growth) audits AI agents for hidden actions and unauthorized decisions. Founded in 2026 in San Francisco.
  15. 🇺🇸 Browser Use (browser-use/browser-harness, 18.2K stars, 16.1x growth) makes websites accessible for AI agents and builds Browser Harness, a self-healing harness that connects LLMs to a real browser, jev-ultrafast, a fast and cheap web agent, and video-use, a video editor driven by coding agents. Founded in 2024 in San Francisco. Raised $17.5M from Felicis, Y Combinator, Nexus, SV Angel, Pioneer Fund, Liquid 2, A.Capital, etc.
  16. 🇺🇸 Palmier (palmier-io/palmier-pro, 14.5K stars, 14.4x growth) is a macOS video editor with built-in generative AI that coding agents control via MCP. Founded in 2024 in San Francisco. Raised $0.5M from Y Combinator.
  17. 🇺🇸 Oblien (oblien/openship, 13.8K stars, 13.8x growth) is a runtime of hardware-isolated VMs for AI agents and the developer of Openship, a self-hostable deployment platform. Founded in 2025 in San Francisco.
  18. 🇺🇸 HydraDB (hydra-db/hydradb, 12.8K stars, 12.8x growth) is a graph database built on object storage for agent memory and enterprise knowledge graphs. Founded in 2025 in San Francisco. Raised $6.5M from Sky9, AHEAD, Better, Explorer34, Incisive, Mission Street, etc.
  19. 🇺🇸 Corsair (corsairdev/corsair, 13.0K stars, 11.1x growth) is an integration layer that connects AI agents and apps to hundreds of third-party APIs through a single interface. Founded in 2024 in New York. Raised $0.5M from Y Combinator.
  20. 🇺🇸 Comp AI (trycompai/crm, 11.0K stars, 11.0x growth) automates compliance and builds Comp AI CRM, a CRM run by AI agents. Founded in 2025 in Miami, FL. Raised $36.6M from Roo, Grand, OSS, Founders Inc.
  21. Anyone with a featuring on ROSS Index Q3 2026 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.