| ALGOL D | ⊕ 1969 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | Hypothetical family of syntax-extended Algol 60s |
| BABEL | ⊕ 1969 | ↓ ↑ ⊕ Multi-purpose | ⊕ True ALGOL60s | ⊕ United Kingdom | Extensible NPL ALgol 60 |
| BESM-Algol | ⊕ 1969 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Russian Federation | Algol for the BESM system |
| Revised ALGOL 60 | ⊕ 1969 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ International | ALGOL 60 dialect |
| SFD-ALGOL | ⊕ 1969 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| Trieste Algol | ⊕ 1969 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Italy | Algol 60 with a 2-dimensional printing language |