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A complete Scheme programming environment for major Unix systems, Windows, and the Macintosh. Includes a module system and an object system as well as platform-independent graphics. An ideal Scheme for beginners, one of its major design goals is a flexible teaching environment.
A commercial Scheme system from Erian Concept with an unlimited freely downloadable evaluation version (requires registration). It includes a CLOS-like object system and is available for Linux/x86, FreeBSD, Solaris (x86 and Sparc), Be (x86), and Windows.
A broad-spectrum systems-programming environment for Unix embedded in R5RS Scheme (actually within version 0.53 of Scheme48). Support for concurrent system programming, sophisticated I/O and automatic garbage collection for process resources.