| BRL FORTRAN | ⊕ 1962 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United States | FORTRAN for the BRLESC II and III |
| BUGTRAN | ⊕ 1962 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United States | Debugging dialect of FORTRAN II |
| FLAT | ⊕ 1962 | ↓ ↑ ⊕ Multi-purpose | ⊕ Fortran I-III Variants | ⊕ United States | Indiana load and go FORTRAN |
| FORTRAN 63 | ⊕ 1962 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United States | CDC Fortran with extensible arithmetic |
| FORTRAN V | ⊕ 1962 | ↓ ↑ ⊕ Numerical Scientific | ⊕ Fortran I-III Variants | ⊕ United States | Interim FORTRAN with string and character handling |
| SIFT | ⊕ 1962 | ↓ ↑ ⊕ Specialised Languages | ⊕ Fortran I-III Variants | ⊕ United States | Fortran->Fortran translator |