Pilib

From PilibWiki

pilib is a Fortran 9x library. Its name is an acronym which stands for platform independend library. With pilib, you can, independently from the operating system and compiler you are using, create GUIs (graphical user interfaces), do binary file input/output etc. Currently, pilib is under development, but it is already possible to create working programs with it. Some features are still missing, others may not work in certain circumstances (or even work not at all). But a numerous of basic features are already usable at least on Linux/Unix and Windows operating systems and with a few of tested compilers.