Possible GCC front ends.

Common Lisp

• CLiCC

  GPL. ANSI? Compiles to C. Last updated 1995.

• OpenMCL

  LGPL. ANSI. Compiles to PowerPC machine code? Last updated October 2005 (1.0).

• CLISP

  GPL. ANSI. Compiles to byte code. Last updated August 2005 (2.35).

• CMUCL

  BSD License, public domain. ANSI. Compiles to machine code. Last updated October 2004 (19a-patch-002).

• SBCL (derived from CMUCL)

  BSD License, public domain. ANSI. Compiles to machine code. Last updated October 2005 (0.9.6).

• GCL

  GPL. CLtL1. Compiles to C. Last updated August 2005. Mail thread about GCL as a GCC front end.

• ECoLisp

  License? ANSI? Compiles to C. Last updated September 1997.

• ECL (derived from ECoLisp)

  License? ANSI? Compiles to C. Last updated November 2005 (0.9h).

• MusCL

  Extremely liberal license. Unfinished. No compiler. Last updated July 2003.

To investigate further: integrates well with C (since the GCC back end is written in C)?

Some links:

• CLiki
• Lisp tag survey
• Lisp on Usenet
• ANSI Common Lisp specification: local copy, ALU, Xanalys, Franz.
• Usenet thread: LISP to C vs machine level.
• The Association of Lisp Users.
• CLiki.
• comp.lang.lisp FAQ.
• cons.org, host for many Lisp projects.
• CLOCC - the Common Lisp Open Code Collection.
CCLAN - The Comprehensive Common Lisp Archive Network.
• Common Lisp Cookbook.
• Common Lisp info by Kent Pitman.
• MacLisp info, also by Kent Pitman.
• Loving Lisp, free web book.
• Kent Pitman's papers. UNWIND-PROTECT vs Continuations.
• Richard Gabriel's papers.
• Henry Baker's papers.
• Some Useful Lisp Algorithms: Part 1 and Part 2, by Richard C Waters.
• Ken Anderson's papers on performance and other things.
• Howard R. Stearns' "MOP for code processing".
• Common Lisp pitfalls.
• Papers from Japan Lisp Users Group Meeting 2000.
• Faré's LispM page.
• Related dialects: MacLisp, ISLisp (spec), EuLisp (spec).

Forth

• Gforth. Last updated August 2003 (0.6.2).

Some links:

• Forth Interest Group.
• Forth, Inc.
• Draft proposal 6 of ANS Forth.
• ForthFreak Wiki.
• Sleepless Night Wiki, General Forth Topics.
• Web clone of Starting FORTH.
• Forth research at Vienna University.
• Forth articles at UltraTechnology.
• Forth stuff at Taygeta.
• Forth papers by Bradford Rodriguez.
• Forth papers and articles by Jason P. Bennett.
• Forth papers at Mountan View Press.
• Build your own Forth.

Scheme

• Shoe

  GPL. R⁵RS. Compiles to x86 machine code. Last updated October 1999.

• Guile

  GPL. Last updated December 2004 (1.6.7).

• Scheme 48

  BSD-like licence. R⁵RS. Compiles to byte code. Last updated July 2005 (1.3).

• Stalin

  GPL. R⁴RS. Compiles a single Scheme source file to C. Last updated June 2001.

• MzScheme

  LGPL. R⁵RS. Compiles to byte code or C. Last updated December 2004 (209).

• SCM

  GPL. R⁵RS. Compiles to C (with Hobbit). Last updated June 2005 (5e1).

• Bigloo

  GPL, LGPL. R⁵RS. Compiles to C and Java. Last updated October 2004 (2.6f).

• SIOD

  Unknown license. Unknown standard compliance. Last updated May 1997 (3.5).

Some links:

• shemers.org.
• R⁵RS browsable at shemers.org.
• Steele's and Sussman's Lambda papers, at readscheme.org's Scheme bibliography.
• Compiling Scheme to JavaScript

Haskell

• GHC

  Haskell 98. Last updated September 2005 (6.4.1).

Standard ML

• SML/NJ

  SML 97. BSD-like license. Last updated October 2005 (110.56).

• MLton

  SML 97. Last updated November 2004 (20041109).

Other Stuff

The Great Computer Language Shootout. (old link)
Language List