| OPAL | ⊕ 1972 | ↓ ↑ ⊕ Specialised Languages | Other algorithmic | ⊕ United States | |
| OSL/2 | ⊕ 1970 | ↓ ↑ ⊕ Experimental and other | Other algorithmic | ⊕ United States | Systems language |
| PIL | ⊕ 1969 | ↓ ↑ ⊕ Specialised Languages | Other algorithmic | ⊕ United States | Procedure Implementation Language |
| SAL | ⊕ 1977 | ↓ ↑ ⊕ Specialised Languages | Other algorithmic | ⊕ Denmark | Paper language suitable for semantic definition |
| Stark algorithm language | ⊕ 1968 | ↓ ↑ ⊕ Specialised Languages | Other algorithmic | ⊕ United States | Language for showing provable algorithms |