One Instruction Set Computer. A parody of RISC (Reduced Instruction Set Computer), in which there is only one instruction: Subtract and branch unless positive.
A language developed on the model of Q-BAL, with some added queue manipulation operations and a completely redesigned control flow mechanism.
The predecessor to Orthogonal, which differs by a bug in the specification.
A two-dimensional fungeoid developed independently of and around the same time as Befunge-93. Unlike Befunge, instructions are not necessarily single characters, but written in 'cells' a few characters wide.