Franz Allegro is a CL compiler available for Linux, Unix, and Windows. Free and commercial versions.

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]

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]

World Wide Web server implemented in CL; goal: to rapidly prototype, smoothly evolve experimental, novel, or complex applications for the WWW. [Open Source]

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]

Corman Lisp and PowerLisp compilers with support for 68k and PPC Macs. [Shareware/Freeware for personal use]

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.

ANSI CL, has interpreter, Lisp to C compiler, can make standalone executables or libraries to call from C programs. [Open source, LGPL]

Embeddable Common Lisp, implementation to embed in C-based programs; FTP site.

Level-0 description document with history, definitions.