A language that relies on self-reference, though I can't remember how it works. Its filename extension, .BAK, was chosen specially to cause confusion with the backup files that some of the more traditional editors automatically create.
A two-dimensional language in which the program counter can move in any of the four main compass directions. Each instruction is represented by a single character, and the instruction set is based on a stack-based machine. The language has no built-in distinction between code space and data space, and so programs can be self-modifying.
The original version, Befunge-93, has as its program space an 80 × 25 torus. Later versions, Befunge-96, Befunge-97 and Funge-98, generalise this to an unbounded Lahey space.
See also: Apple Befunge
A one-dimensional fungeoid in which program flow can go in either direction through a ring of instructions.
(Sometimes two or more of the asterisks in the name are censored out with letters.)
A Turing tarpit of eight parameterless instructions, designed as a tiny language for which the world's smallest compiler could be produced.
Along with Shelta, it is one of the few esoteric languages that has been bootstrapped, i.e. a Brainf*** compiler has been written in Brainf***.
See also: Doublef***
An extension of Brainf*** with an extra instruction to support multithreading.
Brainf*** Ugly Bodge. An adaptation of Brainf*** to be even easier to interpret than Brainf*** already is. It is straightforward to translate any Brainf*** program into Bub.
Has no conditionals or loops; all control flow must be done using computed jumps.
A simple language in which everything is a byte in syze.