Aider

Aider is the open-source, terminal-based AI pair-programming tool created by Paul Gauthier. It is known for tight git integration, auto-commits, and clean diff presentation; developers install it as a Python package and point it at any repo. It works out of the box with models like Claude Sonnet and GPT-5. In the Coding Agents ecosystem it represents the lightweight and controllable end of the spectrum next to products like Cursor and Claude Code.