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Java-Based 7
Guile 5
| | Functional - Compilers, Programming, Computers
Compilers and Interpreters - Lisp, Languages, Programming, Computers 37
Implementations - Logo, Lisp, Languages, Programming, Computers 25
Software - Scheme, Lisp, Languages, Programming, Computers 24
 Better SchemeBetter 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.
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BiglooBigloo
 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]
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Chez SchemeChez Scheme
 Reliable, high performance implementation, by Cadence Research Systems. Free version exists. [Commercial]
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ChickenChicken
 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.
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CMU AI Repository Free/Shareware Scheme ImplementationsCMU 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.
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3DScheme3DScheme
 Two systems for Windows with built in "industrial-strength" solid modeler based on the ACIS solid modeler Geometric Modeling Kernel.
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EdSchemeEdScheme
 Interpreter for Macintosh or Windows. Has "friendly and convenient interactive programming environment" with language sensitive editor, full documentation. [commercial, free 14 day download]
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Elk Scheme: The Extension Language KitElk 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.
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Elk: Scheme-based Extension Language KitElk: Scheme-based Extension Language Kit
 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.
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EuScheme SourcesEuScheme Sources
 Small implementation of Level 0 EuLisp, downloads in formats: tar, tgz, zip.
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An Executable Denotational Semantics for SchemeAn Executable Denotational Semantics for Scheme
 SchemeDS, as defined in R5RS. Program coded in R5RS Scheme. Description, documents, downloads. [AppSolutions Software Licensing]
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GalapagosGalapagos
 An interactive multithreaded Scheme interpreter with turtle graphics for Windows 95, based on SCM.
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GambitGambit
 A portable, high-performance implementation of Scheme based on an optimizing compiler by Marc Feeley. Developed at University of Montreal.
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GaucheGauche
 An R5RS Scheme implementation developed to be a handy script interpreter. Quick startup, built-in system interface, native multilingual support. [Open source, BSD license]
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Indiana University Scheme Repository: ImplementationsIndiana University Scheme Repository: Implementations
 Even more Scheme implementations freely available from the Indiana U. repository.
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Infer ProjectInfer Project
 Statically-typed Scheme, written in Infer, combines many of the best features of Scheme and ML; polymorphic. NSF funded. Description, draft manual.
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Inlab SchemeInlab 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.
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Kali SchemeKali Scheme
 A distributed implementation of Scheme that permits efficient transmission of higher-order objects such as closures and continuations.
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The Ksi Scheme InterpreterThe Ksi Scheme Interpreter
 Ksi is a portable, embeddable Scheme implementation written in C. Unfortunately its documentation is all in Russian at this point.
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KSM-SchemeKSM-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.
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Larceny ProjectLarceny 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.
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LispMeLispMe
 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.
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LispMeLispMe
 Newer versions here. Scheme system for the Palm Pilot PDA developed by Fred Bayer.
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MIT SchemeMIT Scheme
 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 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.
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NarsiNarsi
 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.
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OaklispOaklisp
 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]
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OSchemeOScheme
 Small, embeddable interpreter, mostly Scheme R4RS compliant, with extensions: supports prototype-based object model, some POSIX system calls, compilable in secure mode. Description, download, links.
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PC SchemePC Scheme
 Texas Instruments system for DOS OS; no longer maintained; download formats: source, executable/binary.
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Petite Chez SchemePetite 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]
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PicoPico
 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.
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Pilo Visualization Tools for Scheme: PVTSPilo Visualization Tools for Scheme: PVTS
 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, screenshots, download. Open source, GPL.
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PLT SchemePLT 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.
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Pocket SchemePocket 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]
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PseudoschemePseudoscheme
 Embeds Scheme in Common Lisp.
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QSchemeQScheme
 A fast, small Scheme interpreter which is mostly compliant with the R5RS standard.
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Scheme 48Scheme 48
 A small and portable implementation based on a bytecode interpreter designed to be used as a testbed for experiments in implementation techniques.
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Scheme 48Scheme 48
 Jonathan A. Rees's unofficial page: history, links, status.
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Scheme 48 User's GuideScheme 48 User's Guide
 HTMLized by Margaret Fleck, one of the authors of Envision.
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Scheme Implementations and Mailing ListsScheme Implementations and Mailing Lists
 A list of Scheme implementations from the Scheme FAQ maintained by Mark Kantrowitz.
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Scheme-to-CScheme-to-C
 DEC's venerable translator, runs on most anything with an ANSI C compiler.
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Schoca (Scheme for OCaml)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]
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SCMSCM
 A portable Scheme implementation written by Aubrey Jaffer.
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ScshScsh
 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.
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Scsh FAQScsh FAQ
 The FAQ for Scsh, the Scheme Shell.
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SIOD: Scheme in One DefunSIOD: 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.
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SizzleSizzle
 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.
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SketchySketchy
 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.
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STkSTk
 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.
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STklosSTklos
 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.
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SXM, CXEMASXM, 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.
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TT
 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.
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T HistoryT History
 Fairly detailed, by Olin Shivers.
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T ProjectT Project
 History with: downloads, contributors, timeline, publications, influence, users, successors, Olin history errata. By Jonathan A. Rees.
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T Revival ProjectT 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.
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TachyTachy
 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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TinySchemeTinyScheme
 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]
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Unlikely SchemeUnlikely Scheme
 Small, standard-complying implementation, in C++. [Open source, zlib license]
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VSCMVSCM
 A portable Scheme implementation written by Matthias Blume of Princeton University. No longer actively developed.
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Vx-schemeVx-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]
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WinScmWinScm
 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.
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XLISPXLISP
 A superset of the Scheme dialect of Lisp with extensions to support object-oriented programming.
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XLisp-PlusXLisp-Plus
 Lisp version based on, and evolutionary improvement on, experimental XLisp.
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XLisp-StatXLisp-Stat
 Based on XLisp, but with built-in statistics support.
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