Simple interpreter, runs on Java VM, with 3 visual aids/tools to support learning functional programming via Scheme; has viewers (environment, function call, cons-cell), i.e., global environment, recursive trees, linked list. Description, thesis, scre...

A complete Scheme system that is fully compatible with Chez Scheme but uses high-speed threaded interpreter technology in place of Chez Scheme's incremental native-code compiler. [Freeware]

Texas Instruments system for DOS OS; no longer maintained; download formats: source, executable/binary.

From MIT, for many systems, has code library, includes most functionality of ANSI Standard Common Lisp (CLtL2), many low-level OS interactions. Distributed with system is LIAR (LIAR Imitates Apply Recursively), optimizing compiler that outputs native ...

Simple, efficient Scheme run-time system, for SPARC architecture. Petit Larceny is portable and emits C, for Linux (Intel IA32), Macintosh OS X (PowerPC), Solaris (SPARC), Windows. Common Larceny runs on Microsoft Common Language Runtime (CLR), emits ...

A R5RS Scheme interpreter which integrates with C, allowing calling of C functions and accessing C variables from Scheme. It provides a mechanism to load C shared libraries. It runs on x86 and PowerPC based Linux systems.

A distributed implementation of Scheme that permits efficient transmission of higher-order objects such as closures and continuations.

A commercial Scheme which is freely available for non-commercial use on Linux and FreeBSD. It has support for several features like bitmap/greymap processing and can be used as a general tool for image processing, OCR or specialized optical object and...

Statically-typed Scheme, written in Infer, combines many of the best features of Scheme and ML; polymorphic. NSF funded. Description, draft manual.

Even more Scheme implementations freely available from the Indiana U. repository.