Gauche is an R7RS Scheme implementation aimed to be a handy tool for daily works. Quick startup, built-in system interface and native multilingual support are some of the goals.
several vaguely related projects worked on by me: a 3d engine with a javascript-like scripting language (pdsys); an older scheme dialect (vmsys); ... (2009-04-28: I have been gone for years, may try to put up some newer stuff...).
This project hosts a Scheme Integrated Development Environment and Debugger based on Eclipse. Includes a Gambit debugger. It currently uses the Dynamic Languages Toolkit which supports the DBGp debug engine protocol.
VSGE is a platform-independent, "very simple" game engine based on the SDL and OpenGL libraries. Using unorthodox technologies when appropriate, it strives to make developing non-trivial games simple and fun.
Redtail is a scripting engine library and script language. The Redtail library provides the ability to execute Scheme-like Redtail scripts from within an application, increasing flexibility.