ThinkRail from JetBrains
Summary
ThinkRail is an open-source agentic IDE from JetBrains InnovationHub that uses git worktrees to create isolated AI-enabled workspaces. It pairs with a real agent across Monaco tabs, terminals, and diffs, guided by a spec-first graph that represents project intent. The project ships with cross-platform installers and a browser UI, emphasizing an open, extensible architecture.