| CITRUS | ⊕ 1963 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | COBOL-based list package |
| L6 | ⊕ 1963 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | Laboratories Low-Level Linked List Language |
| SLIP | ⊕ 1963 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | Symmetric LIst Processsor |
| TIPL | ⊕ 1963 | ↓ ↑ ⊕ String and List Processing | ⊕ List | ⊕ United States | Interactive IPL interpreter |