fmake - Small script for easy creation of makefile for Fortran (standard 90 or higher) projects
OMNI Compiler - Fortran 2003/2008 front-end and back-end with high-level intermediate representation to build source-to-source translator.
Fortran legacy tools - tools for fixed to free format conversion, conversion to lower case source code and extraction of local variable declarations (to separate subroutine arguments from local variables)
fortran-syntax - simple fortran syntax checker, including automatic fixing of the code.
stylist - Style checking for Fortran, PSyclone DSL, etc
Pastebin - site to post code in many programming languages, including Fortran, and get syntax highlighting
GGG (Geneva Group Graphics) - permits the creation of PostScript files from a FORTRAN program, and the automatic insertion into a LaTeX text
nmltab - Python module and command-line tool to semantically tabulate, diff and superset Fortran namelist files, by Andrew Kiss
convert_FORTRAN_case - Python 3 script for case conversion of source code files written in fixed form Fortran
fortran-linter - simple Fortran syntax checker in Python, including automatic fixing of the code, by Corentin Cadiou and Alexandre Poux
fover - semantic versioning library written in and for modern Fortran, by Guidi Zhou and Jacopo Chevallard