Larceny
A simple and efficient run-time system for Scheme, currently running on the SPARC architecture. A portable implementation that generates C (dubbed "Petit Larceny") is also being developed.
LispMe
Newer versions here. Scheme system for the Palm Pilot PDA developed by Fred Bayer.
LispMe
Fred Bayers home page is really the home of this Scheme for 3COM Pilot PDA systems: compiler and runtime system intended mainly as a tool to quickly try ideas and algorithms, but can write dialog-based applications.
MIT Scheme
From MIT, for many systems, has comprehensive 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 machine code, has Edwin interactive Emacs-derived editor written in pure Scheme and the subject of an MIT AI Lab Memo. Arguably one of the best Scheme systems available, unarguably one of largest. Major downfall: its not totally R5RS compliant, more so for hygienic macros and #f versus the empty list. Version 7.5 now available for x86 systems.
MzScheme
Small, embeddable, scripting PLT Scheme implementation: R5RS compliant, full numerical tower, threads (all platforms), exceptions, modules, class-based objects, regular-expression matching, TCP/IP. For Macintosh, Unix, Windows 32-bit.
narsi
A portable scheme interpreter by Britt Park. Also other free software, including: Cdoc - a simple program to generate pretty TeX output from annotated c or c++ code; Userblock - a simple user space block device driver kit for Linux; UVFS - a user space filesystem kit.
Open Scheme
From Erian Concept, has CLOS-like object system; runs on Be/x86, FreeBSD, Linux/x86, Solaris (SPARC, x86), Windows. [commercial, unlimited free download evaluation copy with registration]
Petite Chez Scheme
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]
PLT Scheme
Advocacy and authoring group, umbrella name for family of implementations: DrScheme (Scheme, MzScheme, MrEd); books: How to Design Programs, How to Use Scheme; and TeachScheme! project. University-based, supported by many volunteers writing code, documentation.
Pocket Scheme
For MIPS, SH3, ARM-based Windows CE devices. Supports Aubrey Jaffer's SLIB, has initialization file for same, parenthesis-balancing text editor. Windows NT version exists. [Open Source, Artistic License]
Pseudoscheme
Embeds Scheme in Common Lisp.
QScheme
A fast, small Scheme interpreter which is mostly compliant with the R5RS standard.
RScheme
Portable, extended Scheme with reflective object(-oriented) system, operating system services, modules, threads, many system programming features (integrates with, compiles to C or bytecodes) and useful extensions. [Open Source]
Scheme 48
A small and portable implementation based on a bytecode interpreter designed to be used as a testbed for experiments in implementation techniques.
Scheme 48 manual pages
HTMLified by Margaret Fleck, one of the authors of Envision.
Scheme->C
DEC's venerable Scheme to C translator which runs on most anything with an ANSI C compiler.
Schoca (Scheme for OCaml)
An implementation of the Scheme language in OCaml. The primary purpose of Schoca is the use as an embedded extension language in OCaml applications. [Open source, GPL]
SCM
A portable Scheme implementation written by Aubrey Jaffer.
Scsh
A broad-spectrum systems-programming environment for Unix embedded in R5RS Scheme (actually within version 0.53 of Scheme48). Support for concurrent system programming, sophisticated I/O and automatic garbage collection for process resources.
Scsh FAQ
The FAQ for Scsh, the Scheme Shell.
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