Allegro CL
Franz Allegro is a CL compiler available for Linux, Unix, and Windows. Free versions are available.
CLISP
Interpreter and FASL compiler, portable ANSI Common Lisp implementation, CLtL2 conformant, available for many platforms; multilingual user interface. [Open Source, GPL]
CMU Common Lisp: CMUCL
Implementation of Common Lisp programming language, runs on most major Unix platforms, mainly conforms to ANSI CL standard; fast compiler outputs native code code of near C speed; powerful module system, data structures. [Freeware]
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]
Common Lisp to C Compiler: CLiCC
Not a Common Lisp system, compiles Lisp programs into working C programs; coded in Lisp; supports strict, very large subset of Common Lisp + CLOS. Descriptions, documents, downloads. [Open Source, GPL]
Corman Technologies
Corman Lisp and PowerLisp compilers with support for 68k and PPC Macs. [Shareware/Freeware for personal use]
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.
ECL (Embeddable Common Lisp)
ANSI Common Lisp implementation that includes an interpreter and Lisp to C compiler. Can produce standalone executables or libraries that can be called from C programs. [Open source, LGPL]
librep
A shared library implementing a Lisp dialect that is lightweight, reasonably fast, and highly extensible. It contains an interpreter, byte-code compiler and virtual machine. Applications may use the interpreter as an extension language, or it may be used for standalone scripts. [Open source, GPL]
LispWorks
Provides a full native implementation of Common Lisp Windows, Linux, Unix.
OpenLisp
An interpreter for the IsLisp language. Free for non-commercial use.
OpenMCL
An open-sourced Common Lisp implementation for LinuxPPC.
Opus
A version of Berkeley Franz Lisp for 386-based NetBSD systems.
Pico Lisp
Minimilist Lisp dialect and virtual machine. Reference, tutorial, FAQ. Downloads. [Open source, GPL]
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]
Sapiens Software Star Sapphire Common LISP
A free DOS-based Common LISP implementation with CLOS from Sapiens Software. Site includes a comprehensive reference manual for Common LISP.
Scieneer Common Lisp (SCL)
A multi-threaded CL supporting SMP Unix systems.
Ufasoft LISP
Common Lisp development system. Includes command-line and IDE Lisp interpreters. Possibility of creating EXE-files. [Free for non-commercial and education use]
Wade's Common Lisp: WCL
Implements Common Lisp for Linux on x86 hardware, has large subset of Common Lisp as a shared library that can be linked with Lisp and C code to make efficient, small programs; suitable for embedding in other programs.
Xanalys LispWorks
An integrated cross-platform development tool for ANSI Common Lisp. [Free and commercial versions]
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