Interpreter for Macintosh or Windows. Has "friendly and convenient interactive programming environment" with language sensitive editor, full documentation. [commercial, free 14 day download]
Publishes and carries excellent educational materials, including books, using the Scheme programming language. Has Windows and Macintosh Scheme interpreters and a Scheme-driven state-of-the-art solid modeler.
A compilation of colleges, universities, and secondary schools which use Scheme in their curricula. Compiled and maintained by Ed Martin of Schemers, Inc.