| 20-GATE | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Internal Translators | ⊕ United States | GATE for the G-20 |
| ALCOR | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ International | ALCOR-Gruppe ALGOL |
| ALGY | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ⊕ United States | Formula manipulation language |
| ALPHA | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Russian Federation | Russian rich maths extension of Algol 60 |
| Case ALGOL | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | ALGOL 60 from Case |
| DASK Algol | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Denmark | Danish ALGOL |
| ENGINEER | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Moscow languages | ⊕ Russian Federation | Minsk-1 Engineering Autocoder |
| Grasselli and McCluskey ALGOL | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Linear | ⊕ United States | ALGOL modified for programming logical problems |
| HARTRAN | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United Kingdom | Harwell FORTRAN |
| MADCAP II | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Multiline | ⊕ United States | Second version of MADCAP |
| Oak Ridge ALGOL compiler | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | Algol compiler for CDC 1604 |
| S1 | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United Kingdom | Harwell FORTRAN II |
| SIRIUS Autocode | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Early Autocodes | ⊕ United Kingdom | Autocode for the Ferranti Sirus |
| SMALGOL | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| SMALGOL-61 | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| X1 Algol 60 | ⊕ 1961 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Netherlands |