OpenHands, built by All Hands AI as the successor to OpenDevin, takes a GitHub issue and works through it mostly unsupervised: planning a fix, writing the code, running the project's tests, and opening a pull request, all inside a sandboxed Docker container so nothing it does touches the actual machine directly. It supports Claude, GPT-4o, Gemini, and open models through your own API key, which keeps it vendor-neutral compared to agents tied to a single model provider.
Being open source and MIT licensed, it can be self-hosted and inspected line by line, which matters for teams wary of giving a closed-source agent write access to their repositories. The sandboxing also means a bad or hallucinated command doesn't become a real incident, since everything the agent does is contained.
It has around 90,000 GitHub stars, making it one of the most popular open-source autonomous coding agents, and a common reference point for anyone comparing closed products like Devin against what's available to self-host for free.