| AMBIT/L | ⊕ 1970 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | AMBIT symbolic system for lists |
| LPL | ⊕ 1970 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | List Programming Language |
| PDP FLEX | ⊕ 1970 | ↓ ↑ ⊕ Specialised Languages | ⊕ List | ⊕ United States |