Based on XLisp, but with built-in statistics support.

Lisp version based on, and evolutionary improvement on, experimental XLisp.

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

Small, standard-complying implementation, in C++. [Open source, zlib license]

HTMLized by Margaret Fleck, one of the authors of Envision.

DEC's venerable translator, runs on most anything with an ANSI C compiler.

Object-oriented Scheme dialect with first-class types, multiple inheritance, lexically distributed method definitions. based on bytecode emulator, yet reasonably fast. Description, downloads, bibliography. [Open Source, GPL]

Scheme-like language coded in C# for .NET framework. First implementation is interpreter, compiler is planned. Main focus: programming language learning, experiment. Kept as small (now under 1000 lines) and simple as possible. Open source, BSD license.

Small implementation of Level 0 EuLisp, downloads in formats: tar, tgz, zip.

Scheme environment for Windows 3.1/95; interpreter independent, though defaults to Jaffer's SCM. Used at University of Lille 1, France, for introductory programming course. Free downloads. English, Francaise.