| ALGOL X | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ Germany | Algol 60 revision proposal |
| Basic FORTRAN | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ FORTRAN IV standard | ⊕ United States | |
| Constraint Algol | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | Algol 60 with constraints |
| Extended ALGOL | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| IFIP ALGOL | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ International | |
| Klerer-May System | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ||
| MATHLAB | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Arithmetic | ⊕ United States | Interactive maths language |
| Proposal Writing Language | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Plan languages | ⊕ United States | |
| Schoonschip | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ⊕ Switzerland | Symbolic maths |
| STL Online Computer System | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Algebraic | ⊕ United States | Improved version of Tanoga Park CFS |
| VALGOL II | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United States | |
| VPRPAK | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Arithmetic | ⊕ United States | A set of subroutines to do variable precision and rational arithmetic |
| Whetstone Algol | ⊕ 1964 | ↓ ↑ ⊕ Numerical Scientific | ⊕ True ALGOL60s | ⊕ United Kingdom |