| ABC | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Sound-Performance | ⊕ United Kingdom | |
| AL | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | TSL knowledge representation language | |
| Andorra-I | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United Kingdom | Bristol U Andorra | |
| C flat | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | obscurantist C | |
| CPL | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United Kingdom | Categorical Programming Lanugage | |
| DICE | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | OO CAE system | |
| ESL | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Robotics | ⊕ United States | |
| expect | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | ||
| JOSIE | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Frame languages | ⊕ United States | |
| Lingo | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Animation | ⊕ United States | Macromedia animation scripting language |
| LinxBasic | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Street basics | ⊕ Canada | Generator language |
| Mma | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Algebraic | ⊕ United States | Mathematical system |
| nML | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Grammar and Syntax-oriented | ⊕ United States | Grammar specification language |
| Omega | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Prototyping | ⊕ Austria | Protype based OOL |
| Parsec | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | C-based parallel simulation language | |
| PiCTeX | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ 2d shape | ⊕ United States | Picture extensions to TeX |
| Sqil | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ France | Intermediate language for functional programming languages | |
| Starlog | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Interval time | ⊕ Canada | Stratified Temporal Prolog |
| UltraCPL | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ Numerical Control | ⊕ United States | CAM systems language |
| WinSTRUDL | ⊕ 1991 | ↓ ↑ ⊕ Specialised Languages | ⊕ United States | STRUDL for Windows |