# Free open-source agent frameworks

> Harnesses, swarms and runtimes for building and running teams of AI agents.

Free tools: popular open-source projects that do not replace a paid product.

## Projects, ranked
1. [Ruflo](https://repoquarry.dev/projects/ruflo.md): Multi-agent harness and plugin set for Claude Code and Codex (formerly Claude Flow), adding agent swarms, memory and an MCP server. Commercial use: Confirmed.
2. [Agents](https://repoquarry.dev/projects/agents.md): Multi-harness agentic plugin marketplace for Claude Code, Codex, Cursor, OpenCode, GitHub Copilot, Google Antigravity, and Pi Commercial use: Confirmed.
3. [Paperclip](https://repoquarry.dev/projects/paperclip.md): Self-hosted Node.js server and web UI for running a team of AI coding agents (Claude Code, Codex, Cursor and others) with goals, tasks and budgets. Commercial use: Confirmed.
4. [OpenRig](https://repoquarry.dev/projects/openrig.md): CLI for defining a team of Claude Code and Codex agents in YAML and starting them together in tmux on macOS or Linux. Commercial use: Confirmed.
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Source: RepoQuarry (https://repoquarry.dev/categories/agent-frameworks). Data licence: CC BY 4.0. Quotes are from project documentation and belong to their authors.