Browse free open source Agent Harnesses and projects for Linux below. Use the toggles on the left to filter open source Agent Harnesses by OS, license, language, programming language, and project status.
The open harness for creative work
Z.ai's coding agent harness. Powerful, intelligent, extensible
DeepSeek Harness: Everything is a Plugin
Your own personal AI assistant. Any OS. Any Platform.
AI agent toolkit: coding agent CLI, unified LLM API, TUI & web UI
Self-healing browser harness that enables LLMs to complete any task
Agent harness to make your slop code well-engineered and beautiful
Workspace to find, build, and collaborate with AI agents
AI agent harness for AI coding agents
Superplan is a CLI-first execution system.
Excalibur is a highly opinionated agent harness
Portable multi-agent harness for .agents-based skills, workflows
FrontierAgent, our agent framework, open-sourced alongside it
Autonomous coding agent as an SDK, IDE extension, or CLI assistant.Ope
Secure The Unknown
Free desktop app for Claude Code, Codex and OpenCode
The batteries-included agent harness
GUI Exploration Lab. One of the best GUI agent solutions
Python framework for AI workflows and pipelines with chain of thought
Ultra Recipe for Training Long-Horizon Search Agents
JS-native framework for building and managing multi-agent systems
Harness LLMs with Multi-Agent Programming
The one and only agent harness for complex codebases
LLM powered fuzzing via OSS-Fuzz
The best agent harness