Ranked · Coding agents
Best Open source Coding agents
11 quality-gated open source coding agents, compared on structured facts · pricing $5–$20 · 80% of known offer an API.
The ranking
11 of the 25 coding agents in this index qualify as open source — every one a Published, quality-gated listing, not a scraped row.
Across the set: 8 of 10 with known API status (80%) expose a public API, paid plans span $5–$20, and 11 offer a free or freemium tier.
11 of 11 carry a fact-verification date; the freshest check is 2026-08-23.
Open-source is a genuine spread of licenses here, not one thing: Apache-2.0 (OpenAI Codex CLI) from a frontier lab that also sells closed products elsewhere, AGPLv3 (Juggler) from an independent project, and MIT (Aider, Cline, OpenCode, OpenHands, Zot) — the license affects what you're allowed to do if you fork or redistribute, even though all seven are free to use today.
How we ranked these
Assembled programmatically from the live index: every entry is a Published, quality-gated listing in Coding agents carrying the "Open source" tag, ranked by tier then name. The numbers (11 tools, 80% of known with an API, paid plans $5–$20) are computed from the structured facts on those listings — this page exists only because the underlying data clears the density gate.
All picks at a glance
All 11 compared on one screen. Pick a row to jump to the full entry.
The ranking
Editor’s pick
#1
Aider
Open-source AI pair programming in your terminal, free under Apache 2.0, built to run against 14 LLM providers
Best forMost mature MIT-licensed option, no vendor lock-in
MIT-licensed, terminal-native, and the most mature of the open-source options here — a safe default if you just want a free, transparent agent with no vendor lock-in.
- #2
Cline
The open-source coding agent. Bring your own key. Runs in your editor, terminal, and as an SDK, with optional ClinePass for flat-rate open-model access.
- #3
Goose
Open source AI coding agent with a desktop app, CLI, and 70+ MCP extensions across 15+ LLM providers, backed by the Linux Foundation
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Juggler
A free, open-source visual workbench for AI coding agents: each session is an editable Yjs tree, not a transcript. Single Go binary, no Electron, by the creator of JUCE.
Choose Juggler if you specifically want AGPLv3 (a copyleft license that affects SaaS redistribution) and a GUI-first, branching-session workflow.
- #5
Kilo Code
Open source AI coding agent for VS Code, JetBrains, CLI, and Cloud with 500+ models and no markup
- #6
OpenAI Codex CLI
OpenAI's open-source (Apache-2.0) terminal coding agent, bundled into ChatGPT plans from Free through Pro — Business seats are grandfathered-only.
Choose Codex CLI if you want an open-source agent backed by a large lab's ongoing investment (OpenAI), not an independent project — with the tradeoff that it defaults to OpenAI's own models.
- #7
OpenCode
A free, open-source (MIT) AI coding agent for the terminal, desktop and IDE, with 75+ model providers, built-in subscription login, and a tested model marketplace behind it.
- #8
OpenHands
Open source platform for cloud coding agents. Free local OSS, free Individual Cloud tier, self-hosted Enterprise with SSO and RBAC.
Choose OpenHands if you need an open-source platform designed for enterprise self-hosting (sandboxed deployment, an embeddable SDK), not just a personal CLI tool.
- #9
Warp
An open platform for automating development: an open-source terminal, a standalone coding agent, and cloud-agent factories that orchestrate Claude Code, Codex, Gemini CLI and Warp's own agent across your SDLC.
- #10
Zed
The open-source, GPU-native code editor built from scratch by Atom's creators — runs Claude Code, Codex and other agents via the Agent Client Protocol it created.
- #11
Zot
A free, MIT-licensed coding-agent harness in one Go binary. Branch any session from any past message, run 30+ model providers from one catalog, and DM the agent from Telegram.
Side by side
All 11 compared. Scroll the table sideways, the fact column stays pinned →
| Feature | Aider | Cline | Goose | Juggler | Kilo Code | OpenAI Codex CLI | OpenCode | OpenHands | Warp | Zed | Zot |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Description | Open-source AI pair programming in your terminal, free under Apache 2.0, built to run against 14 LLM providers | The open-source coding agent. Bring your own key. Runs in your editor, terminal, and as an SDK, with optional ClinePass for flat-rate open-model access. | Open source AI coding agent with a desktop app, CLI, and 70+ MCP extensions across 15+ LLM providers, backed by the Linux Foundation | A free, open-source visual workbench for AI coding agents: each session is an editable Yjs tree, not a transcript. Single Go binary, no Electron, by the creator of JUCE. | Open source AI coding agent for VS Code, JetBrains, CLI, and Cloud with 500+ models and no markup | OpenAI's open-source (Apache-2.0) terminal coding agent, bundled into ChatGPT plans from Free through Pro — Business seats are grandfathered-only. | A free, open-source (MIT) AI coding agent for the terminal, desktop and IDE, with 75+ model providers, built-in subscription login, and a tested model marketplace behind it. | Open source platform for cloud coding agents. Free local OSS, free Individual Cloud tier, self-hosted Enterprise with SSO and RBAC. | An open platform for automating development: an open-source terminal, a standalone coding agent, and cloud-agent factories that orchestrate Claude Code, Codex, Gemini CLI and Warp's own agent across your SDLC. | The open-source, GPU-native code editor built from scratch by Atom's creators — runs Claude Code, Codex and other agents via the Agent Client Protocol it created. | A free, MIT-licensed coding-agent harness in one Go binary. Branch any session from any past message, run 30+ model providers from one catalog, and DM the agent from Telegram. |
| Pricing | Free (Apache 2.0) / forever | Free | Free (self-hosted) | Free | Free | Free | Free | Free (Free) | Free | $0 / forever | Free |
| API | No | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | No | Yes |
| Tags |
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This ranking
- 11 agents ranked
- 8 of 10 with known API status offer an API
- paid plans $5-$20
- 11 free or freemium
- verified August 23, 2026
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