Openchamber

OpenChamber is an open source agentic development environment for AI coding. It runs as an instance on a machine the user controls, whether a Mac, a Linux box or a server, and keeps agent sessions alive after the app is closed. Users can start an agent in one place and pick up the same session from another. Access comes through a desktop app for macOS, Windows and Linux, a browser, a progressive web app, a native mobile app that is in beta, and extensions for VS Code, Cursor, Windsurf and Trae. A private relay carries an end to end encrypted connection without an open port, and phones pair once with a QR code. The environment works with the models a team already uses. Work can start from a GitHub issue or pull request, a Linear ticket, a stated goal, or a schedule. Session Goals keep an agent going until the outcome is done, blocked or over a set limit. Multi run executes one task across up to five models in parallel, each in its own worktree, and Fusion keeps the best result or combines the strongest parts. A built in browser lets agents test the running app. A Changes Walkthrough groups a large diff into ordered steps for review, and a terminal, file browser, notes and todos sit beside the chat, along with provider limits, token usage and cost per session. The software is open source and free to download. No paid plans are listed.