| AAIMS | ⊕ 1979 | ↓ ↑ ⊕ Business Data Processing | ⊕ Array | ⊕ United States | Array-based querying system |
| APLOMB | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ Array | ⊕ Italy | Structural extensions to APL |
| APLSF | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ Array | ⊕ United States | DEC APL with shared system functions and system variables |
| Wyoming structured APL | ⊕ 1979 | ↓ ↑ ⊕ Specialised Languages | ⊕ Array | ⊕ United States | APL with Dijkstra's structures |