This category attempts to be a comprehensive listing of Scheme implementations and compilers available. This includes both commercial efforts, free software, and archaic implementations which are of historical interest. Guile (5) Java-Based (7) 1. 3DScheme - Two systems for Windows with built in "industrial-strength" solid modeler based on the ACIS solid modeler Geometric Modeling Kernel. 2. Better Scheme - 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. 3. Bigloo - System with one goal: enable Scheme programming style where C(++) is usually needed; makes Scheme practical via features found in most normal languages but not Scheme and functional programming. Generators for C code, Java Virtual Machine, .NET bytecode. [Open Source, GPL] 4. Chicken - A Scheme compiler which compiles a subset of R5RS into C. Uses the ideas presented in Baker's paper "Cheney on the MTA". It is highly portable, reasonably efficient and makes interfacing to C and C++ very easy. 5. DrScheme - Full Scheme programming environment for Macintosh, many Unixes, Windows. Has module and object systems, platform-independent graphics. Ideal for beginners; one of the major design goals is a flexible teaching environment. 6. EdScheme - Interpreter for Macintosh or Windows. Has "friendly and convenient interactive programming environment" with language sensitive editor, full documentation. [commercial, free 14 day download] 7. Galapagos - An interactive multithreaded Scheme interpreter with turtle graphics for Windows 95, based on SCM. 8. Gambit - A portable, high-performance implementation of Scheme based on an optimizing compiler by Marc Feeley. Developed at University of Montreal. 9. Gauche - An R5RS Scheme implementation developed to be a handy script interpreter. Quick startup, built-in system interface, native multilingual support. [Open source, BSD license] 10. Indiana University Scheme Repository: Implementations - Even more Scheme implementations freely available from the Indiana U. repository. 11. Infer Project - Statically-typed Scheme dialect, written in Infer, combines many of the best features of Scheme and ML. NSF funded. 12. Inlab Scheme - 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 pattern recognition. 13. KSM-Scheme - 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. 14. 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. 15. LispMe - Newer versions here. Scheme system for the Palm Pilot PDA developed by Fred Bayer. 16. 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. 17. 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. 18. 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. 19. 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] 20. Pseudoscheme - Embeds Scheme in Common Lisp. 21. QScheme - A fast, small Scheme interpreter which is mostly compliant with the R5RS standard. 22. Scheme 48 - A small and portable implementation based on a bytecode interpreter designed to be used as a testbed for experiments in implementation techniques. 23. Scheme 48 User's Guide - HTMLized by Margaret Fleck, one of the authors of Envision. 24. Scheme-to-C - DEC's venerable translator, runs on most anything with an ANSI C compiler. 25. SCM - A portable Scheme implementation written by Aubrey Jaffer. 26. SIOD: Scheme in One Defun - Very small, portable implementation, has some database, Unix programming, CGI scripting extensions. Runs on DOS, Linux, Unix, Windows. Free source downloads. 27. Sizzle - A Scheme interpreter implemented as a library which can be embedded into C programs, as well as a standalone interpreter. Mostly R5RS, Guile compatible, and includes regular expressions and most Posix functions. 28. SXM, CXEMA - Portable Scheme implementation, conforms to IEEE/ANSI standard, supports all features of R5RS Report, many features of Chez Scheme and various SRFIs. Derived from XScheme: object system dropped, many changes, additions. 29. The Ksi Scheme Interpreter - Ksi is a portable, embeddable Scheme implementation written in C. Unfortunately its documentation is all in Russian at this point. 30. TinyScheme - Based on Mini-Scheme, tiny implementation, almost a full R5RS Scheme. Goal: embedded scripting use, but works as standalone interpreter and extensible shell tool. Recent changes reduced executable size to about 64KB on Linux/x86. [BSD] 31. Unlikely Scheme - Small, standard-complying implementation, in C++. [Open source, zlib license] 32. VSCM - A portable Scheme implementation written by Matthias Blume of Princeton University. No longer actively developed. 33. Vx-scheme - A compact (<64 Kb) implementation of R4RS Scheme that compiles for VxWorks/Tornado (and is integrated with the system symbol table). [Open source, Artistic License] 34. WinScm - 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, Française. 35. XLISP - A superset of the Scheme dialect of Lisp with extensions to support object-oriented programming. 36. XLisp-Plus - Lisp version based on, and evolutionary improvement on, experimental XLisp. 37. XLisp-Stat - Based on XLisp, but with built-in statistics support. 38. An Executable Denotational Semantics for Scheme - SchemeDS, as defined in R5RS. Program coded in R5RS Scheme. Description, documents, downloads. [AppSolutions Software Licensing] 39. Chez Scheme - Reliable, high performance implementation, by Cadence Research Systems. Free version exists. [Commercial] 40. CMU AI Repository Free/Shareware Scheme Implementations - Yet more Scheme implementations from the CMU AI Repository. Many of these are also available from the Indiana University Scheme Repository. 41. Elk Scheme: The Extension Language Kit - 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. 42. EuScheme Sources - Small implementation of Level 0 EuLisp, downloads in formats: tar, tgz, zip. 43. Kali Scheme - A distributed implementation of Scheme that permits efficient transmission of higher-order objects such as closures and continuations. 44. Larceny Project - 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 MS IL not native or C code. 45. Lego/Scheme Compiler - For Lego MindStorms Robot kits, alternative to Visual Basic. Description, documents, downloads. 46. Narsi - Portable scheme interpreter by Britt Park. Other free software: Cdoc, simple program to generate pretty TeX output from annotated C/C++ code. Userblock, simple user space block device driver kit for Linux. UVFS, user space filesystem kit. 47. Oaklisp - 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] 48. PC Scheme NEW! - Texas Instruments system for DOS OS; no longer maintained; download formats: source, executable/binary. 49. 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] 50. Pico NEW! - Tiny, expressive; made to teach advanced computer science ideas to non-computer science students; mixes power of languages like Scheme, with standard infix notation known from calculus. Has: garbage collected tables (arrays), higher order functions, objects, meta programming, reflection. 51. 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] 52. Scheme 48 - Jonathan A. Rees's unofficial page: history, links, status. 53. Scheme Implementations and Mailing Lists - A list of Scheme implementations from the Scheme FAQ maintained by Mark Kantrowitz. 54. 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] 55. Scsh - Scheme Shell, broad-spectrum system programming environment for Unix, embedded in R5RS Scheme 48. Supports concurrent system programming, sophisticated I/O and automatic garbage collection for process resources. 56. Scsh FAQ - The FAQ for Scsh, the Scheme Shell. 57. Sketchy - Interpreter for pure functional applicative Scheme dialect, a variant of pure LISP plus global definitions (define), first-class continuations (call/cc), input/output functions (read, write, ...). Downloads: source, binaries. Sells: tutorial, reference manual. 58. Stalin NEW! - A powerful optimizing Scheme compiler from Jeffery Mark Siskind at the NEC Research Institute. Sacrifices functions such as call/cc in favor of efficiency, but generated code is remarkably bulletproof and fast. 59. STk - R4RS Scheme interpreter with interface to access Tk graphical package; can be seen as a standard Tk package with Tcl replaced by a Scheme interpreter. Has efficient CLOS-like object-oriented system, STklos. 60. STklos - Derived from STkn implementation based on an ad-hoc virtual machine, byte compiler; compilable as library to embed in other programs, has object system with MOP, multiple inheritance, generic functions, multimethods, module system, full R5RS tower of numbers, link to GTK+ X toolkit; almost R5RS compliant (in process), to support as many final SRFIs as possible, now supports SRFI-6. 61. T - 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. 62. T History - Fairly detailed, by Olin Shivers. 63. T Project - History with: downloads, contributors, timeline, publications, influence, users, successors, Olin history errata. By Jonathan A. Rees. 64. T Revival Project - Scheme dialect and implementation, incompatible with R5RS, but an R3RS compatibility layer exists; to grow more compatible with R5RS over time. Description, manual, downloads, mail list, IRC, contacts, plans. 65. Tachy - 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.

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