| Basic FORTRAN | 1964 | Numerical Scientific | FORTRAN IV standard | United States | |
| BTL Fortran | 1967 | Numerical Scientific | FORTRAN IV standard | United States | Bell labs Fortran IV |
| CORTRAN | 1965 | FORTRAN IV standard | United States | Cornell FORTRAN | |
| DEFT | 1973 | Numerical Scientific | FORTRAN IV standard | Canada | Structured FORTRAN |
| DELtran | 1975 | On-Line | FORTRAN IV standard | United States | Fortran interpreted to DEL |
| FORTRAN H | 1969 | FORTRAN IV standard | United States | ||
| FORTRAN IV | 1962 | Numerical Scientific | FORTRAN IV standard | United States | first major release of FORTRAN |
| FORTRAN VI | 1963 | FORTRAN IV standard | United States | ||
| GENTRAN | 1971 | FORTRAN IV standard | United Kingdom | Dialect of FORTRAN for the GENESYS system | |
| RC-Fortran | 1968 | Numerical Scientific | FORTRAN IV standard | Denmark | Fortran for the RC 4000 |
| WATFIV | 1969 | Numerical Scientific | FORTRAN IV standard | Canada | Waterloo FORTRAN 2nd version |
| WATFOR | 1966 | Numerical Scientific | FORTRAN IV standard | Canada | WATerloo FORtran |