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

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

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/

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

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

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/

Iota, Jot, Zot
   Iota is unambiguous Turing complete language with only 2 symbols, heavily uses lambda calculus. Jot is Iota variant with elegant Goedel numbering. Also: 4 line Iota implementation, 5 line Jot implementation in Scheme, JavaScript interpreters for both lang
   http://ling.ucsd.edu/~barker/Iota/

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

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/

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/

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

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/

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

The Unlambda Programming Language
   Minimalistic functional language based on the Lambda calculus but lacking the Lambda operator. Tutorial, reference, GPLed interpreters available.
   http://www.madore.org/~david/programs/unlambda/

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

XS: XML-based Obfuscated Programming Language
   Toy language. Harness the power of XML, by using it as a programming language. Compiler, sample code; interesting speculations on language design. By Mark Carter.
   http://www.markcarter.me.uk/computing/xs.html

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

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

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://www.gaertner.de/~schoenfr/npiet/