| 1401 structured language | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ Other US historic | ⊕ United States | Pedogogical language for IBM 1401 |
| CORAL 66 | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ Other UK historic languages | ⊕ United Kingdom | Realtime English military language |
| EPL | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ IBM PL/Is | ⊕ United States | Early PL/1 |
| EXCHLF | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ 2G Autocodes | ⊕ United Kingdom | Extension of CHLF3 for ATLAS |
| Glypnir | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ Other Algol 60s | ⊕ United States | Parallel ALGOL |
| IMP | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ 3G Autocodes | ⊕ United Kingdom | IMProved Autocode |
| PL/ACME | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ Other PL/Is | ⊕ United States | PL/I dialect for medical applications |
| SPLINTER | ⊕ 1966 | ↓ ↑ ⊕ Multi-purpose | ⊕ Other PL/Is | ⊕ United States | Scientific PL/I Interpreter |