Termic

Termic is a free, open-source desktop application that lets you spawn several AI coding agent CLIs simultaneously, each isolated in its own git worktree. It runs the actual binaries—Claude, Codex, Antigravity, Copilot, Grok, and others—rather than SDK wrappers, so inference costs come from your existing Pro or Max subscription. The project describes itself as an open-source alternative to Conductor.build.

You can broadcast a single prompt to multiple agents at once and monitor when each finishes. Termic includes built-in support for major vendors' CLIs and lets you add custom tools in 30 seconds. It runs entirely locally with no account or backend required, and updates automatically whenever a vendor ships new features to their CLI.