Old site, last update 1997. Embeddable, reusable extension language subsystem for applications written in C/C++, also a useful standalone Scheme implementation with interfaces to POSIX, Unix, X11.

New site. Embeddable, reusable extension language subsystem for programs coded in C/C++, also a useful standalone Scheme implementation with interfaces to POSIX, Unix, X11.

Interpreter for Macintosh or Windows. Has "friendly and convenient interactive programming environment" with language sensitive editor, full documentation. [commercial, free 14 day download]

Yet more Scheme implementations from the CMU AI Repository. Many of these are also available from the Indiana University Scheme Repository.

Reliable, high performance implementation, by Cadence Research Systems. Free version exists. [Commercial]

Language designed and largely implemented, now a matter of coding, documenting. Goals: high consistency; improve language's functional nature; consistency with lambda calculus; optimize, but not at cost of other goals.

SchemeDS, as defined in R5RS. Program coded in R5RS Scheme. Description, documents, downloads. [AppSolutions Software Licensing]

Two systems for Windows with built in "industrial-strength" solid modeler based on the ACIS solid modeler Geometric Modeling Kernel.