# Best Open source Coding agents

> Source: https://theagentsindex.com/best/coding-agents/open-source (curated, quality-gated, re-verified)

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.

| # | Name | What it is | Pricing | API |
| --- | --- | --- | --- | --- |
| 1 | [Aider](https://theagentsindex.com/aider.md) | Open-source AI pair programming in your terminal, free under Apache 2.0, built to run against 14 LLM providers | free | No |
| 2 | [Cline](https://theagentsindex.com/cline.md) | 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. | freemium | Yes |
| 3 | [Goose](https://theagentsindex.com/goose.md) | Open source AI coding agent with a desktop app, CLI, and 70+ MCP extensions across 15+ LLM providers, backed by the Linux Foundation | free | Yes |
| 4 | [Juggler](https://theagentsindex.com/juggler.md) | 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. | free | No |
| 5 | [Kilo Code](https://theagentsindex.com/kilo-code.md) | Open source AI coding agent for VS Code, JetBrains, CLI, and Cloud with 500+ models and no markup | freemium | Yes |
| 6 | [OpenAI Codex CLI](https://theagentsindex.com/codex-cli.md) | OpenAI's open-source (Apache-2.0) terminal coding agent, bundled into ChatGPT plans from Free through Pro — Business seats are grandfathered-only. | freemium | Yes |
| 7 | [OpenCode](https://theagentsindex.com/opencode.md) | 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. | freemium | Yes |
| 8 | [OpenHands](https://theagentsindex.com/openhands.md) | Open source platform for cloud coding agents. Free local OSS, free Individual Cloud tier, self-hosted Enterprise with SSO and RBAC. | freemium | Yes |
| 9 | [Warp](https://theagentsindex.com/warp.md) | 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. | freemium | Yes |
| 10 | [Zed](https://theagentsindex.com/zed.md) | 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. | freemium | No |
| 11 | [Zot](https://theagentsindex.com/zot.md) | 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. | free | Yes |

## Methodology

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.