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

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/

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/

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

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/

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

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

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/

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: "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

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

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

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/

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/

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

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

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

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/

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