| CAT | 1983 | Specialised Languages | Germany | ||
| CAT | 1990 | United States | |||
| CAT/S | 1988 | Computer aided instruction language | |||
| Catalysis | 1998 | Specialised Languages | United States | Object modelling language | |
| Catalyst | 1968 | On-Line | Generation of JOSS I | United States | |
| CATALYST/NBS | 1972 | Specialised Languages | CAI languages | United States | Authoring/Programming environment at UoP |
| CATIA | 0 | ||||
| CATL | 1969 | Specialised Languages | Plan languages | United States | Computer-Assisted Template Layout |
| CATO | 1966 | CAI languages | United States |