Most-Starred Open-Source AI Agent Projects (2026)

The open-source AI agent projects in our directory with the most GitHub stars, across every category. Below are the top 25 of 430 matching tools in the AgentScout directory, ranked.

How we ranked: Ranked by GitHub stars as recorded on each AgentScout listing (link checks 2026-10-18). Tools without a tracked public repo come after, in alphabetical order. Stars measure developer popularity, not quality or fit for your job, so read each listing before you choose. No paid placements.

1. O

   1. OpenClaw

   personal agentsOpen source★ 391,938 GitHub stars

   Open-source personal agent you run yourself and reach over chat apps.

   Pricing (as stated): Open source · Active

2. R

   2. REA

   MCP & infraOpen source★ 301,645 GitHub stars

   MCP server and CLI that lets coding agents reverse engineer native binaries, Electron and JavaScript apps, .NET assemblies and live websites, using Ghidra, Hopper or IDA under the hood.

   Pricing (as stated): Open source · Mature

3. H

   3. Hermes Agent (Nous Research)

   frameworksOpen source★ 253,590 GitHub stars

   Open-source agent harness; v0.21.7 stable shipped Oct 12, v0.22.0 RCs Oct 13-14.

   Pricing (as stated): Open source · Active, frequent releases

4. D

   4. DeepSeek Harness

   frameworksOpen source★ 251,853 GitHub stars

   DeepSeek's open-source agent harness with a local web UI, built so that every tool, model and scheduled task is a swappable plugin; still a developer preview.

   Pricing (as stated): Open source · Mature

5. O

   5. opencode

   codingOpen source★ 213,329 GitHub stars

   Open-source terminal coding agent that works with many model providers.

   Pricing (as stated): Open source · Active

6. A

   6. AutoGPT

   frameworksOpen source + cloud★ 187,612 GitHub stars

   One of the first autonomous agent projects, now a platform for building, deploying and running continuous AI agents that automate workflows.

   Pricing (as stated): Open source + cloud · Mature

7. D

   7. Dify

   no-code buildersOpen source + cloud★ 158,410 GitHub stars

   Open-source platform for building LLM apps and agents visually.

   Pricing (as stated): Open source + paid cloud · Mature

8. L

   8. Langflow

   no-code buildersOpen source + cloud★ 155,757 GitHub stars

   Visual drag-and-drop builder for AI agents and workflows that you can run locally, deploy as an API or expose as an MCP server.

   Pricing (as stated): Open source + cloud · Mature

9. O

   9. OpenAI Codex CLI

   codingOpen source★ 129,112 GitHub stars

   OpenAI's open-source coding agent for the terminal; also runs in the cloud.

   Pricing (as stated): Open source; uses ChatGPT plan or API · Mature

10. G

    10. Graphify

    codingOpen source★ 127,237 GitHub stars

    Turns a codebase plus its docs, SQL schemas, configs and PDFs into a knowledge graph that coding agents can query.

    Pricing (as stated): Open source · Mature

11. B

    11. Browser Use

    browser/computer useOpen source + cloud★ 117,912 GitHub stars

    Library that lets AI agents control a web browser.

    Pricing (as stated): Open source + paid cloud · Mature

12. G

    12. Gemini CLI

    codingOpen source★ 107,334 GitHub stars

    Google's open-source terminal agent powered by Gemini.

    Pricing (as stated): Open source; free tier · Mature

13. P

    13. Paperclip

    business agentsOpen source★ 103,425 GitHub stars

    Self-hosted app for running a team of AI agents like a small company, with org charts, goals, budgets and approval gates across Claude Code, Codex, OpenClaw and other harnesses.

    Pricing (as stated): Open source · Mature

14. C

    14. Claude-Mem

    codingOpen source★ 101,230 GitHub stars

    Gives coding agents memory across sessions by capturing what they do, compressing it and feeding the relevant context back in later.

    Pricing (as stated): Open source · Mature

15. A

    15. Agent-Reach

    researchOpen source★ 98,176 GitHub stars

    Lets an AI agent read and search sites like X, Reddit, YouTube and GitHub through one toolkit, without paid APIs.

    Pricing (as stated): Open source · Mature

16. O

    16. Orca

    codingOpen source★ 94,443 GitHub stars

    Agent development environment for running a fleet of parallel coding agents on your own subscriptions and reviewing their work.

    Pricing (as stated): Open source · Mature

17. R

    17. RAGFlow

    frameworksOpen source + cloud★ 92,335 GitHub stars

    Open-source RAG engine with deep document parsing and agent features for building grounded question-answering over your files.

    Pricing (as stated): Open source + cloud · Mature

18. M

    18. MCP reference servers

    MCP & infraOpen source★ 91,237 GitHub stars

    Official collection of reference MCP servers.

    Pricing (as stated): Open source · Mature

19. O

    19. OpenHands

    codingOpen source + cloud★ 90,845 GitHub stars

    Open-source platform for autonomous coding agents.

    Pricing (as stated): Open source + paid cloud · Mature

20. C

    20. Crawl4AI

    browser/computer useOpen source★ 85,667 GitHub stars

    Open-source crawler that turns websites into clean, LLM-ready Markdown for agents and RAG pipelines.

    Pricing (as stated): Open source · Mature

21. D

    21. Deer Flow

    researchOpen source★ 83,959 GitHub stars

    ByteDance's open-source long-horizon agent harness that researches, codes and creates using sandboxes, memory and sub-agents.

    Pricing (as stated): Open source · Mature

22. C

    22. Career Ops

    personal agentsOpen source★ 75,234 GitHub stars

    Open-source job search agent that scans job boards and scores each posting against your CV before you apply.

    Pricing (as stated): Open source · Mature

23. R

    23. Ruflo

    frameworksOpen source★ 74,609 GitHub stars

    Open-source multi-agent meta-harness for Claude Code, Codex, and MCP clients; Oct 13 release adds Mods (mission workflows) and a single control plane with human approval.

    Pricing (as stated): Open source (MIT); model costs still apply · Active

24. M

    24. MetaGPT

    frameworksOpen source★ 70,885 GitHub stars

    Multi-agent framework that assigns roles like product manager and engineer to LLM agents to build software.

    Pricing (as stated): Open source · Mature

25. C

    25. Cline

    codingOpen source★ 70,289 GitHub stars

    Autonomous coding agent inside VS Code with step-by-step approvals.

    Pricing (as stated): Open source · Mature

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Related: Open-source agents by task · Self-hosted AI agents

More best-of lists: All best lists · Best AI Coding Agents · Best AI Agent Frameworks · Best AI Browser Agents · Best Open-Source MCP Servers · Best Self-Hosted AI Agents · Best Free AI Agents (Free Plans) · Best No-Code AI Agent Builders · Best AI Voice Agent Platforms · Best AI Vision Tools for Agents · Best AI Agent Observability & Eval Tools · Best Personal AI Agents · Best AI Agents for Business Teams · Best Crypto AI Agents · Best AI Productivity Agents

Facts come from our directory listings; pricing is as each maker states it and GitHub stars are as recorded on each listing. Check official sites before you choose.