Fortran programming language family

Fortran (; formerly FORTRAN) is a third-generation, compiled, imperative programming language designed for numeric computation and scientific computing.

Ratfor (short for Rational Fortran) is a programming language implemented as a preprocessor for Fortran 66. It provides modern control structures, unavailable in Fortran 66, to replace GOTOs and statement numbers.

extension of Fortran 90 with constructs that support parallel computing

programming language

ALTRAN (Algebraic Translator) is a programming language for the formal manipulation of rational functions of several variables with integer coefficients. It was developed at Bell Labs in 1960s. ALTRAN is a FORTRAN version of ALPAK rational algebra package, and “can be thought of as a variant of FORTRAN with the addition of an extra declaration, the ‘algebraic’ type declaration.”

FORMAC, the Formula Manipulation Compiler, was the first computer algebra system to have significant use. It was developed by Jean E. Sammet and her team, as an extension of FORTRAN IV. The compiler was implemented as a preprocessor taking the FORMAC program and converting it to a FORTRAN IV program which was in turn compiled without further user intervention.