All nodes of genre "Pedagogical language"
by Cat's Eye Technologies
A toy language for a toy race-condition finder.
Iphigeneia is a toy programming language which contains features from both imperative programming (assignments to mutable variables,
whileloops,) and functional programming (immutable name bindings, Scheme-style "named
let" loops.) It was originally intended as a testbed for algorithms that convert programs between the two forms.
Maentwrog is an RPN-calculator-turned-FORTH-interpreter which probably counts as Chris Pressey's first proper programming language. It was implemented on his Amiga 500 in 1993, then lost and unearthed multiple times. It is hardly remarkable, save that it spawned Befunge-93.