Aider

Aider runs in the terminal as an AI pair programmer that edits files directly in a local git repository. Each change lands as a commit with a generated message, so work can be reviewed, diffed, or undone with ordinary git tools. To stay effective in larger projects it builds a map of the entire codebase and feeds relevant context to the model, and it supports over 100 programming languages. It connects to Claude, GPT-4o and the o-series, DeepSeek, and local models, and adds practical extras: a watch mode for IDE integration, voice input, automatic lint and test runs after edits, and the ability to include images or web pages as context. Installation is a Python pip package, and the project is open source under the Apache 2.0 license. It is widely used by developers who prefer working from the command line, and the maintainers report that a large share of each release's code is written by aider itself.