Scheme Requests For Implementation:A forum for people interested in coordinating libraries and other extensions of the Scheme language between implementations.
CMU Scheme Repository: Part of the greater CMU AI Repository. Has a large overlap with the Indiana repository.
Hello, World Program: Scheme version of this canonical first program.
Indiana University's Internet Scheme Repository: The definitive resource for Scheme on the net. Contains a large catalog of implementations, useful source code, and documents, many of which you won't find anywhere else.
Lisp and Scheme Meetup Day: Meetup with other local programmers interested in Lisp, Scheme and other functional programming languages.
MIT Project MAC (Switzerland) Archive: The MIT Project on Mathematics and Computation (Switzerland) has a public FTP archive with Scheme implementations, programs, and curiosities.
Online Bibliography of Scheme Research: This site contains a large (and growing) bibliography of articles, theses, and technical reports related to the Scheme language. Where an online version of the paper is available, a link is provided.
Practical Scheme: Libraries and extensions to use Scheme as a production tool, to process daily chores for system engineers and programmers: parse files, generate reports, watch processes, provide small GUI wrappers, etc. English, Japanese.
Reports on the Algorithmic Language Scheme: Specifications for the programming language Scheme.
RRRS-Authors Mailing List Archive: An archive of the mailing list of the authors of the RnRS, from 1984 to 1998.
Scheme Programming Language: Growing article, with links to many related topics. [Wikipedia]
Schemers, Inc.: 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.
Schemers.org: A collection of resources for the Scheme language. The place to go to get comprehensive, up-to-date information on all aspects of Scheme: implementations, papers, and code. Maintained by the Rice Programming Languages Team, the folks behind MzScheme and DrScheme.
The comp.lang.scheme FAQ: Usenet discussion group FAQ archive.
The Scheme Programming Language: Main page at MIT, Scheme's birthplace; short list of implementations, some general documentation, information on the MIT Scheme implementation, some random links.
The Scheme Programming Language: By R. Kent Dybvig; Prentice Hall, 1996, ISBN 0134546466, 2nd edition. Reference book, describes R5RS Scheme in style similar to K&R [Online full text version].
The Scheme Underground: An effort aimed at developing useful software packages in Scheme for use in research projects and for distribution on the net.