| ↔ Order by name | ↔ Order by year | ↔ Order by year reverse | ↔ Order by Type | ↔ Order by Sammet category |
| Edison | ⊕ 1992 | ⊕ RETE and production | ⊕ France | ||
| RDL/C | ⊕ 1990 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ France | |
| RDL1 | ⊕ 1988 | ↓ ↑ ⊕ Specialised Languages | ⊕ RETE and production | ⊕ France |