Best Agent Harness tools — Open source
A curated ranking of the Agent Harness tools in the IndieBoot catalog, ordered by community traction on GitHub.
13 in catalog
Best Open source Agent Harness tools
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OpenClaw
The AI that really does things
#1 — 389,767 GitHub stars
Agent Harness -
OpenCode
Open-source terminal coding agent
#2 — 207,619 GitHub stars
Agent Harness -
Claude Code
Agentic coding in your terminal
#3 — 145,171 GitHub stars
Agent Harness -
OpenAI Codex
OpenAI's coding agent
#4 — 124,371 GitHub stars
Agent Harness -
Gemini CLI
Google's open-source AI agent
#5 — 107,003 GitHub stars
Agent Harness -
OpenHands
Open-source autonomous software engineer
#6 — 88,015 GitHub stars
Agent Harness -
Cline
Autonomous coding agent for VS Code
#7 — 68,105 GitHub stars
Agent Harness -
Goose
Block's extensible AI agent
#8 — 54,310 GitHub stars
Agent Harness -
Aider
AI pair programming in your terminal
#9 — 48,970 GitHub stars
Agent Harness -
Continue
The AI code assistant you control
#10 — 35,917 GitHub stars
Agent Harness -
Crush
Glamorous agentic coding for all
#11 — 28,111 GitHub stars
Agent Harness -
Kilo Code
Code with AI without breaking the bank
#12 — 27,316 GitHub stars
Agent Harness -
Onlook
Cursor for Designers
#13 — 26,741 GitHub stars
Agent Harness
Frequently asked questions
- What is the best open source Agent Harness for indie makers?
- Based on the IndieBoot catalog, OpenClaw, OpenCode, Claude Code are strong starting points among the 13 curated open source Agent Harness listings.
- How many open source Agent Harness does the IndieBoot catalog include?
- IndieBoot currently lists 13 curated open source Agent Harness entries, each with official links and context.
- How are the best open source Agent Harness ranked?
- Listings are ranked by GitHub stars (highest first) and then alphabetically, so community-backed options surface at the top.