Reasonix

What it is

This free, openly licensed assistant for programmers looks through your code, changes files, and executes shell commands and test suites within a directory you select. It ships with a DeepSeek preset and accepts any OpenAI-compatible provider, with permission levels, a plan mode that waits for approval, and per-turn rewind of files it edited. Developers who want an agent working in their codebase without a vendor subscription can use the CLI or the Studio desktop app.