Fortran Wiki
Commercial static analysis tools

Cleanscape FortranLint - Fortran static source code analysis tool that reduces your organizational exposure to risks from latent software problems by automatically identifying problems at their source – in the Fortran code prior to compiling or executing programs.

Forcheck – Fortran Analysis - performs a static analysis of a Fortran program or separate Fortran program units.

fpt - Tools for Fortran Engineering - Error Checking, Measurement and Assessment, Structural Engineering, Software Migration, Run-time Testing, and more

plusFORT - multi-purpose suite of tools for analyzing and improving Fortran programs.