3270.io — open source IBM 3270 mainframe tooling Record a 3270 session in the browser, replay it headless at any scale, and watch every workflow land on a live operations console.

3270Web — a browser-based IBM 3270 terminal with AI Chat, chaos exploration, session recording and a REST API.

3270Connect — replays recorded sessions as JSON workflows, headless in CI and across concurrent workers, with Prometheus metrics.

Source on GitHub — both tools are MIT licensed.