By Paul Wilson. Unfinished book, introduces Scheme for programmers, treats implementation strategies. [Online, University of Texas]

Texas Instruments system for DOS OS; no longer maintained; download formats: source, executable/binary.

A list of Scheme implementations from the Scheme FAQ maintained by Mark Kantrowitz.

Scheme-like language developed at Yale; is to Scheme rather as NIL is to Lisp; mainly of interest to historians and theoreticians. FTP for v3.1.

A paper by Will Clinger (1991) explaining the Scheme hygienic macro system by comparison with the Common Lisp macrology. In GZipped PostScript form.

A paper by Will Clinger (1998) which offers an implementation independent definition of proper tail recursion for Scheme. In Gzipped PostScript form.

A paper by Will Clinger (1991) which describes an alternative to the low-level macro facility described in the R4RS. The macrology is based upon the explicit renaming of identifiers.

A paper by Will Clinger and Jonathan Rees (1991) which describes a modified form of Kohlbecker's algorithm for reliably hygienic macro expansion in block-structured languages where macros are source-to-source transformations specified using a high-lev...

(Postscript) A paper by Matthias Blume (1997) which presents an outline of a module system for Scheme to solve several problems encountered with contemporary implementations.

An interface between Common Lisp and X Window.