rio

Rio

Inspired by Notepad++, Emacs, and VS Code. Written from scratch in Tcl/Tk: small modules, plain files, and a client/server core that runs locally or remotely. Built for Linux, macOS, and Windows.

Installation · User manual · Source code

Introducing rio — A few words from the project author.

0.4.0 — alpha · 2 October 2026. Lighter, bounded undo history. Changes · Known limitations.

rio with a file tree, two editor groups, a find bar, project search results, and the agent pane — The editor, with the file tree, split editor, search, and agent pane. More screenshots · On macOS

Project documentation

Architecture decisions · Roadmap · Changelog · Contributing · About