Aider

Aider is the open-source, terminal-native AI pair programmer: it executes multi-file code edits and maintains a clean Git history with automatic, descriptive commits.

This is your command-line AI coding partner: Aider connects your local Git repository to powerful LLMs (GPT-4o, Claude 3.7 Sonnet, DeepSeek) for direct, conversational code modification. It handles complex, multi-file changes across 100+ languages (Python, Rust, JavaScript) without forcing you to leave the terminal. The key differentiator is its Git-native workflow: Aider automatically stages and commits every AI-generated change with a clear, contextual message, giving you a clean, reviewable history and full control. Typical feature costs run low: expect $0.01–0.10 per feature with cloud models.

https://aider.chat