Deno Desktop is a tool that turns Deno projects into self-contained desktop applications, bundling the code, Deno runtime, and a web rendering engine into one binary per platform. It offers small binaries, full Node compatibility, and framework auto-detection. Deno Desktop is available starting in Deno v2.9.0 and provides features like hot module replacement, auto-update, and error reporting. The tool aims to provide a alternative to Electron and Tauri with a smaller footprint and cross-platform support.