• The TextPad editor configured for Fortran
  
  
• The command tool configured with a few additional options
  
  
• Active State Perl
  
  
• The pathy.pl program
  
  
• The cygwin command tool set (especially Portland Group)
  
  
• The dependency program
  
  
• The Fortran Pre-processor
  
  
• Understand for Fortran from Scientific Tools Inc.