pLISP
- Experimental implementation of parallel functional programming. Built as a hybrid architecture, uses simple Lisp interpreter to drive the compiler, and wraps calls to the Graph-reduction VM.
- http://www.thinkartlab.com/pkl/tm/plisp/

GOO
- Generic Object Orientator, replaces Protojunior: OO, type-based prefix-syntax language; like a simpler, more dynamic, Lispy Dylan and OO Scheme; simple, efficient, extensible. Description, manual, rationale, downloads.
- http://people.csail.mit.edu/jrb/goo/

EuLisp Programming Language
- Level-0 description document with history, definitions.
- http://people.bath.ac.uk/masjap/EuLisp/

Common Lisp Hypermedia Server: CL-HTTP
- World Wide Web server implemented in CL; goal: to rapidly prototype, smoothly evolve experimental, novel, or complex applications for the WWW. [Open Source]
- http://www.cl-http.org:8001/cl-http/

DotLisp
- Interactive Lisp dialect for CLR (.Net) scripting, development. Deep CLR integration, sharing type system, GC, other runtime services, transparent access to .Net w/o a FFI or wrappers. Open source, BSD.
- http://dotlisp.sourceforge.net/

L Sharp .NET
- Lisp-like scripting language for .NET; uses Lisp dialect similar to Arc but tightly integrates with .NET Framework which provides a rich set of libraries. Open source GPL.
- http://www.lsharp.org/

PyLisp
- Tiny Lisp in Python: brief description, download.
- http://www.biostat.wisc.edu/~annis/creations/PyLisp/

EuLisp
- Dialect of scope similar to Common Lisp, object-oriented, but organized differently, with claimed cleaner design, by a group of European industrial and academic Lisp users and implementors. Description, FTP server, contacts, links.
- http://www.aiai.ed.ac.uk/~jeff/lisp/eulisp.html

Lush: Lisp Universal SHell
- Object-oriented language for researchers, experimenters, engineers, for large-scale numerics and graphics. Merges 3 languages: (1) weakly-typed, garbage-collected, dynamically scoped, interpreted language with Lisp syntax, (2) strongly-typed, lexically-sc
- http://lush.sourceforge.net/

Manifesto on JAR's Next Language
- Was Jargol. Proposal with wish/feature list.
- http://mumble.net/~jar/articles/language-manifesto.html

ACL2
- Applicative Common Lisp, multipurpose system. Most common uses: language for programming, specification, modeling; a formal mathematical logic, semi-automatic theorem prover. [Open Source, GPL]
- http://www.cs.utexas.edu/users/moore/acl2/

Armed Bear Common Lisp
- ANSI CL, runs on Java Virtual Machine, JVM. Has runtime system, compiler turns Lisp source to JVM bytecode, interactive REPL to develop programs. [Open Source, GPL]
- http://armedbear.org/abcl.html

GNU Common Lisp: GCL
- CL interpreter. Home site: description, mail list, archives, news, CVS, downloads, links. [Open Source, GPL]
- http://www.gnu.org/software/gcl/

CLISP
- ANSI Common Lisp implementation: descriptions, documents, FAQs, downloads, links, developers.
- http://clisp.cons.org/

SBCL: Steel Bank Common Lisp
- Compiler and runtime system for ANSI CL. Has interactive environment including an integrated native compiler, debugger, many extensions; runs on many platforms. [Open Source, GPL]
- http://sbcl.sourceforge.net/

Arc
- New Lisp dialect, by Paul Graham. Software unreleased, but readings in: design philosophy, lessons, why it isn't especially object-oriented, FAQ.
- http://www.paulgraham.com/arc.html

PLisp
- Language gets overall syntax from Common Lisp and operators and datatypes from PostScript (PS). Compiler translates PLisp to PS, which can then run on any PS engine. Wiki page with description, links, code samples.
- http://www.cliki.net/PLisp

newLISP
- General purpose scripting Lisp dialect for Cygwin, FreeBSD, Linux, Mac OS X, Solaris, Win32; like Scheme but with dynamic scoping; GUI version has IDE with editors and source level debugger, Tcl/Tk frontend. [Open Source, GPL]
- http://www.newlisp.org/

ECL: Embeddable Common Lisp
- ANSI CL, has interpreter, Lisp to C compiler, can make standalone executables or libraries to call from C programs. [Open source, LGPL]
- http://ecls.sourceforge.net/

ProLisp
- An interpreter for a lexically scoped minimalistic Lisp of Lisp 1.5 type. It written in C++ and currently runs under Linux. [Open source]
- http://www.aviduratas.de/lisp/prolisp.html

Wade's Common Lisp: WCL
- Implements CL for Linux on x86 hardware, has large CL subset as a shared library that can link with Lisp and C code to make efficient, small programs; suitable for embedding in other programs.
- http://wcl.kontiki.com/

Pico Lisp
- Minimilist Lisp dialect and virtual machine. Reference, tutorial, FAQ. Downloads. [Open source, GPL]
- http://software-lab.de/ref.html

Star Sapphire Common Lisp
- DOS CL implementation with CLOS. Download, full CL reference manual. From Sapiens Software Corp. [free copyrighted unsupported shareware]
- http://www.webweasel.com/lisp/

Allegro CL
- Franz Allegro is a CL compiler available for Linux, Unix, and Windows. Free and commercial versions.
- http://www.franz.com/products/

OpenMCL
- An open-sourced Common Lisp implementation for LinuxPPC.
- http://openmcl.clozure.com/

librep
- Shared library implementing Lisp dialect that is lightweight, fairly fast, highly extensible. Has interpreter, byte-code compiler, virtual machine. Programs may use interpreter as an extension language, or it may be used for standalone scripts. [Open sour
- http://librep.sourceforge.net/

LispWorks Ltd.
- Was Xanalys. Makes LispWorks ORB, Liquid Common Lisp, KnowledgeWorks; integrated cross-platform development tool, full native ANSI Common Lisp for Linux, Mac OS X, Unix, Windows; related products, services. Free and commercial versions.
- http://www.lispworks.com/

Digitool, Inc.
- Makes Macintosh Common Lisp, MCL: for 68k, PowerPC; compiles to native code, supports threads, integrates well into Mac OS, fun; Common Lisp Interface Manager, CLIM: platform independent user interface system, to target other Lisp platforms.
- http://www.digitool.com/

ECoLisp: ECL
- Embeddable Common Lisp, implementation to embed in C-based programs; FTP site.
- ftp://ftp.di.unipi.it/pub/lang/lisp/

Ufasoft Lisp
- Common Lisp development system. Includes command-line and IDE interpreters. Possibility of creating EXE-files. [Free non-commercial and education use]
- http://www.ufasoft.com/lisp/

CMU Common Lisp: CMUCL
- CL implementation, runs on most major Unix platforms, mainly conforms to ANSI CL standard; fast compiler outputs native code, of near C speed; powerful module system, data structures. [Freeware]
- http://www.cons.org/cmucl/

Scieneer Common Lisp: SCL
- Multi-threaded CL, supports symmetrical multiprocessor (SMP) Unix systems.
- http://www.scieneer.com/scl/

Opus
- A version of Berkeley Franz Lisp for 386-based NetBSD systems.
- http://www.aiai.ed.ac.uk/~jeff/franz-for-386.html

Corman Technologies
- Corman Lisp and PowerLisp compilers with support for 68k and PPC Macs. [Shareware/Freeware for personal use]
- http://www.cormanlisp.com/

Common Lisp to C Compiler: CLiCC
- Not a CL system, compiles Lisp programs into working C programs; is coded in Lisp; supports strict, very large subset of CL + CLOS. Descriptions, documents, downloads. [Open Source, GPL]
- http://www.informatik.uni-kiel.de/~wg/clicc.html