| CLIPS | 1986 | Specialised Languages | RETE and production | United States | C Language Integrated Production System |
| CLIPS/R2 | 1990 | Specialised Languages | RETE and production | United States | Rete/2 CLIPS |
| Clips++ | 1996 | Specialised Languages | RETE and production | United States | rewrite with extension of CLIPS in C++ |