This category is for languages deliberately designed to be often unusable, unimplementable, or both. The stress is on "deliberately". A language that is unsuitable for actual programming not by intention but merely (1) due to its inventor's ineptitude, or (2) due to lack of industry support or acceptance by the computer science community, is not obfuscated. Thus this category does not list Pascal, Modula, Ada, or C#.
Obfuscated languages are of two types, those that are: (1) Nothing more, or less, than elaborate jokes; example: Intercal is not much more than a thinking person's diversion, albeit a hilariously funny and impressively creative one. (2) Thoughtful and systematic explorations of the subtleties of programming language and algorithm design, or of the theory of computability.
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/
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/
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/
"Institute" for the standardization of unstandardized standardizable things, mostly esoteric languages and extensions to them. http://esoteric.sange.fi/ENSI/
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
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/
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/
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
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/
Introduction to Malbolge programming. Also propose modificatins of Malbolge for making programming in it more worse. http://www.lscheffer.com/malbolge.html
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/
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
