open source OpenAI Codex alternatives

4 of the alternatives to OpenAI Codex on this site are tagged open source. The rest of the board is at OpenAI Codex Alternatives, where every position says what it paid — a spot there costs $1.

Cline
Open-source coding agent for VS Code and JetBrains that runs on your own API keys.
cline.bot · unpaid — our pick, and a position anyone can claim
Aider
Open-source pair programmer in the terminal that commits its own changes to git.
aider.chat · unpaid — our pick, and a position anyone can claim
OpenCode
Open-source terminal agent that runs against whichever model you point it at.
opencode.ai · unpaid — our pick, and a position anyone can claim
Zed
A native, multiplayer editor written in Rust, with agentic editing built in.
zed.dev · unpaid — our pick, and a position anyone can claim

Looking for open source tools to replace something else? Every open source tool on the site.