C-Intercal Compiler
   William Patterson's DOS port of the classic Intercal-to-C compiler coauthored by Eric S. Raymond.
   http://www.komputado.com/iloj/diversaj.htm#intercal

C-Intercal Supplemental Reference Manual
   Specification clarifications, implementation notes regarding the C-Intercal compiler, and literature references for those interested in background information on COME FROM and friends.
   http://www.progsoc.uts.edu.au/~sbg/intercal/ick.html

Catalog of Compilers Intercal Page
   Idiom's catalog of free compilers and interpreters mentions Intercal.
   http://www.idiom.com/free-compilers/LANG/INTERCAL-1.html

Darren's First Intercal Program
   This was author's first exercise in INTERCAL programming. It counts down from 500 all the way down to one. It's that simple!
   http://webonastick.com/intercal.html

Free Online Dictionary of Computing - Intercal
   Short introduction to Intercal, detailing Intercal's distinctivenesses in comparison to other languages.
   http://www.wkonline.com/d/INTERCAL.html

INTERCAL
   Urban Nilsson's collection of INTERCAL programs.
   http://www.oops.se/~urban/INTERCAL.html

Intercal "Hello, World" Program
   Surprisingly readable chunk of C-Intercal-only source code written by Clemens Meier.
   http://www2.latech.edu/~acm/helloworld/Intercal.html

Intercal Programming Language Reference Manual
   Original specification.
   http://www.progsoc.uts.edu.au/~sbg/intercal/intercal.html

Intercal Resource Page
   Unofficial Intercal language homepage, maintained by C-Intercal implementor Eric S. Raymond. Documentation, implementations, papers, and tools.
   http://catb.org/~esr/intercal/

Jacob Mandelson's Intercal Page
   Featuring a ROT-13 routine and a short link list.
   http://www.ofb.net/~jlm/intercal.html

Revised Reference Manual
   Compiled from the original specification and from the comments and clarifications by Howell and Raymond.
   http://www.muppetlabs.com/~breadbox/intercal-man/

The Language from Hell
   Article and site, non-fiction, and journalism indexes.
   http://www.antipope.org/charlie/journo/intercal.html

The Pit
   Intercal source code by Louis Howell.
   http://www.ofb.net/~jlm/howell.html

Threaded Intercal
   Malcolm Ryan's proposed standard for Threaded Intercal, version 0.2.
   http://www.cse.unsw.edu.au/~malcolmr/intercal/threaded.html

iperl
   Using Intercal in Perl.
   http://catb.org/~esr/intercal/iperl.html