| Language | First appeared | Developer |
|---|---|---|
| /// | 2006 | — |
| Beatnik | — | Cliff L. Biffle |
| Befunge | 1993 | — |
| Brainfuck | 1993 | Urban Müller |
| Deadfish | — | — |
| Emmental | — | — |
| Glass | — | — |
| INTERCAL | 1972 | — |
| Iota and Jot | — | Chris Barker |
| Malbolge | 1998 | — |
| Piet | 1993 | David Morgan-Mar |
| Tink | 2008 | — |
| Unlambda | 1999 | David Madore |
| Whitespace | 2003 | — |