Athas

Athas is a lightweight, open-source code editor built around the idea that your editor, your AI coding agents, and your Git workflow belong in one place. It runs on macOS, Windows, and Linux, and keeps the interface fast and focused rather than loading it with features you won't use.

The core pitch is simplicity without sacrifice. You get a code editor, an integrated terminal, Git controls, and GitHub access, all in a single window. Agents sit beside the code they're changing, so you can review diffs in context rather than switching between tools.

What's included:

• Built-in Athas Agent for chat-driven coding, with support for any OpenAI-compatible model provider and per-task model switching
• Third-party agent support for Claude, Gemini CLI, GitHub Copilot, Antigravity, Kimi CLI, OpenCode, Qwen Code, and others
• Git and GitHub integration built directly into the editor window, no separate client needed
• Integrated terminal so you stay in one window from editing through running
• 102 integrations to shape the editor around your specific stack

Compared to heavier AI-powered editors like Cursor, Athas leans into minimalism. It's not trying to be an IDE with every feature bolted on; it's a focused workspace that stays out of your way. The AGPL-3.0 license means the code is fully open, and development happens in public.

If you already have a preferred CLI agent, Athas is designed to run it natively rather than replace it.