| ART-IM | ⊕ 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | ART with CLIPS features |
| CLIPS/R2 | ⊕ 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Rete/2 CLIPS |
| PCLIPS | ⊕ 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ United States | Parallel CLIPS |
| RDL/C | ⊕ 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ France |