| *Prolog | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ United States | |
| Aquarius Prolog | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ United States | High performance Prolog |
| cu-Prolog | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Japan | |
| ObjVProlog | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Canada | |
| ObjVProlog-D | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ Canada | |
| Prolog 3 | ⊕ 1989 | ↓ ↑ ⊕ String and List Processing | ⊕ Horn clause | ⊕ France | 3rd generation of the logic programming language |
| Prolog-Linda | ⊕ 1989 | ↓ ↑ ⊕ Specialised Languages | ⊕ Horn clause | ⊕ Australia |