Blank  
   Strange Befunge-descendant language.
   http://unefunge.republika.pl/

Turing Tarpit  
   Directory of sites dealing with obfuscated programming languages.
   http://www.geocities.com/ResearchTriangle/Station/2266/tarpit/tarpit.html

The Unlambda Programming Language  
   Minimalistic functional language based on the Lambda calculus but lacking the Lambda operator. Tutorial, reference, GPLed interpreters available.
   http://www.eleves.ens.fr:8080/home/madore/programs/unlambda/

Waduzitdo  
   Turing incomplete programming language written by a guy named Larry, who's friends always asked him about his new PC: "What does it do?" Works via 2 registers: accumulator and match flag which holds one value (T or F).
   http://www.geocities.com/ResearchTriangle/Station/2266/tarpit/waduzitdo/

Weird Programming Languages  
   Yet another list of obfuscated programming languages.
   http://members.tripod.com/rkusnery/weird.html

P-nand-Q  
   Home of esoteric programming languages such as Java2K, Smith#, Sorted!, [], Esogotschi and the Great Python Language Zoo. Also heavy on the code obfuscation front.
   http://www.p-nand-q.com/

Esoteric Programming Languages Ring  
   An organisation started to spread insanity and weird programming paradigms among the masses.
   http://homepage.eircom.net/~kmgaughan/esolang/index.html

Shakespeare  
   A language with beautiful source code that resembled Shakespeare plays.
   http://shakespearelang.sourceforge.net/

BDAMD: Basic Demonic Asinine Multi-Dimensional  
   Home site, by its creator: descriptions, code samples, download.
   http://spots.flatland.com/jms/bdamd.html

ZT  
   The esoteric programming language. Documentation, interpreter, and example programs.
   http://www.winterbergs.de/software/zte.htm

Orthogonal  
   A programming language in which program flow can go sideways. Closely related to Befunge. Tutorial, reference, sample source code, Public Domain implementation available.
   http://www.muppetlabs.com/~breadbox/orth/

GAMIZETA  
   A superset of the BrainFuck programming language.
   http://www22.brinkster.com/badsector/gamizeta/

Q-BAL Programming Language  
   A queue based programming language. It's not designed to be useful, just fun.
   http://homepage.tinet.ie/~kmgaughan/esolang/q-bal/

Esoteric Non-existent Standards Institute  
   "Institute" for the standardization of unstandardized standardizable things, mostly esoteric languages and extensions to them.
   http://esoteric.sange.fi/ENSI/

DM's Esoteric Programming Languages  
   D. Morgan-Mar esoteric languages Chef, Haifu, Ook!, Piet, Whenever. Links.
   http://www.dangermouse.net/esoteric/

XS - XML Programming Language  
   A toy obfuscated programming language from the brain of Mark Carter. Harness the power of XML, by using it as a programming language. Comes with compiler and example code.
   http://www.markcarter.me.uk/computing/xs.html

Whitespace  
   Any non whitespace characters are ignored; only spaces, tabs and newlines are considered syntax.
   http://compsoc.dur.ac.uk/whitespace/

Lesser-Known Programming Languages  
   Brief introductions to LITHP, C-, FIFTH, and other programming languages that have been overdue for a long time.
   http://www.laughnet.net/archive/compute/lesknown.htm

nouse  
   A language in which the IP (instruction pointer) varies depending on the current stack size.
   http://www.geocities.com/qpliu/nouse/

malbolge: "hello world"  
   The very first Malbolge program to appear, how it was crafted (by a genetic algorithm program) and similar things.
   http://www.acooke.org/andrew/writing/malbolge.html

Iota and Jot  
   Iota is an unambiguous Turing-complete language with just two symbols, heavily utilizing the lambda calculus. Jot is an offspring of Iota that provides, among others, a particularly elegant Goedel numbering. This page also contains a four-line Iota impl
   http://ling.ucsd.edu/~barker/Iota/

Cat's Eye Technologies  
   Specifications, implementations, sample source code collections for several strange languages, comments on obfuscated language taxonomy and on several far-out coding practices, mail list, links to many related sites.
   http://catseye.mine.nu:8080/

Comment Programming Language  
   An open-source language for writing comments.
   http://c-p-l.sourceforge.net/

bogusforth  
   By Antonio Maschio. An obfuscated language, powerful, quite complete, based on forth, "false" (by W. van Oortmerssen) and "TRUE" (by Dewi).
   http://it.geocities.com/tonibin

npiet  
   An interpreter for the piet programming language. In this language the programs are pictures, build out of 18 colors and black and white - this is about the real "art of programming".
   http://spog.gaertner.de/~schoenfr/npiet/

PingPong  
   An interpreted two dimensional language based on "Befunge". It is not intended to create useful programs but just to experiment with an unusual programming concept.
   http://www.inz.info/pingpong/

Malbolge: Programming from Hell  
   Specifically designed to be extremely difficult to program in.
   http://en.wikipedia.org/wiki/Malbolge_programming_language

Programming in Malbolge  
   Introduction to Malbolge programming. Also propose modificatins of Malbolge for making programming in it more worse.
   http://www.lscheffer.com/malbolge.html

esoteric.sange.fi  
   Collection of esoteric programming language implementations, examples, and related files.
   http://esoteric.sange.fi/

False  
   Programming language with two main goals: confusing everyone with an obfuscated syntax, and designing as powerful a language as possible with a tiny implementation: this compiler executable is only 1024 bytes, written in pure 68000 assembler.
   http://wouter.fov120.com/false/

l33t  
   An esoteric language inspired by BF and Beatnik which allows l33t h4xX0r5 to write programs in their native dialect.
   http://electrod.ifreepages.com/l33t.htm