# Best Open source Coding agents

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

12 of the 28 coding agents in this index qualify as open source. Every one is a researched, quality-gated listing, not a scraped row.

Across the set: paid plans span $5–$20, and 12 offer a free or freemium tier.

12 of 12 carry a fact-verification date; the freshest check is 2026-09-30.

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 | [Kilo Code](https://theagentsindex.com/kilo-code.md) | Open source AI coding agent for VS Code, JetBrains, CLI and cloud, with 500+ models at provider rates. | freemium | Yes |
| 2 | [goose](https://theagentsindex.com/goose.md) | Open-source local AI agent — desktop app, CLI and ACP server — running on the LLM provider you bring. | free | Yes |
| 3 | [Zed](https://theagentsindex.com/zed.md) | Rust-based code editor with a built-in agent panel, ACP external agents and Zed-hosted models. | freemium | Yes |
| 4 | [Warp](https://theagentsindex.com/warp.md) | Agentic development environment: a terminal, a standalone agent CLI, and unattended cloud coding agents. | freemium | Yes |
| 5 | [Letta](https://theagentsindex.com/letta.md) | Stateful agent harness, cloud and SDK for agents with persistent, git-versioned memory. | freemium | Yes |
| 6 | [Codex CLI](https://theagentsindex.com/codex-cli.md) | OpenAI's terminal coding agent for inspecting, editing and running repository code from the shell. | freemium | Yes |
| 7 | [OpenCode](https://theagentsindex.com/opencode.md) | Open source AI coding agent for the terminal, desktop app and IDE, with 75+ model providers. | freemium | Yes |
| 8 | [zot](https://theagentsindex.com/zot.md) | Single-binary terminal coding agent harness in Go, with 30+ model providers and any-language extensions. | free | Yes |
| 9 | [Juggler](https://theagentsindex.com/juggler.md) | Visual workbench for AI coding agents: branching conversation trees, inspectable model transactions, local or remote. | free | No |
| 10 | [OpenHands](https://theagentsindex.com/openhands.md) | Open-source software engineering agent with GUI, CLI, SDK and an enterprise control plane. | freemium | Yes |
| 11 | [Aider](https://theagentsindex.com/aider.md) | Open-source terminal AI pair programmer that edits files in your local git repo and commits the changes. | free | Yes |
| 12 | [Cline](https://theagentsindex.com/cline.md) | Open-source coding agent for VS Code, JetBrains, the terminal and CI, running on whichever model you bring. | freemium | Yes |

## Methodology

Assembled programmatically from this index: every entry is a researched, quality-gated listing in Coding agents carrying the "Open source" tag, ranked by tier then name. The numbers (12 tools, paid plans $5–$20) are computed from the structured facts on those listings. This page exists only because enough listings carry that tag to make the comparison worth reading.