| ↔ Order by name | ↔ Order by year | ↔ Order by year reverse | ↔ Order by Type | ↔ Order by Sammet category |
| &-Prolog | ⊕ 1990 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Spain | |
| CIAO | ⊕ 1994 | ↓ ↑ ⊕ Experimental and other | ⊕ Horn clause | ⊕ Spain | Distributed And/Or parallel prolog |