| Language | First appeared | Developer |
|---|---|---|
| Starlark | — | — |
| StarLogo | 2001 | MIT Media Lab |
| SuperPascal | 1993 | — |
| Superplan | 1951 | — |
| SYMPL | — | — |
| Tcl | 1988 | John Ousterhout |
| TI-BASIC 83 | — | — |
| Transact-SQL | — | — |
| Turing | 1982 | Holt Software Associates |
| TUTOR | 1969 | — |
| Unicon | — | — |
| Varphi Language | 2025 | — |
| Visual FoxPro | 1984 | Microsoft |
| XBLite | — | — |
| XHarbour | 2001 | — |
| XPL | 1967 | — |
| XPL0 | 1976 | — |
| Yoix | 2000 | — |
| Zeno | — | — |
| Zig | 2015 | Andrew Kelley |
| ZOPL | — | — |