| ALGOL 60 Modified | ⊕ 1977 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ International | 1970 final revision of ALGOL 60 |
| ALGOL-M | ⊕ 1977 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| CONA | ⊕ 1977 | ↓ ↑ ⊕ On-Line | ⊕ True ALGOL60s | ⊕ United Kingdom | Conversational Algol |
| SESPOOL | ⊕ 1977 | ↓ ↑ ⊕ Multi-purpose | ⊕ True ALGOL60s | ⊕ United Kingdom | Simple Extensible Systems PrOgramming Oriented Language |