- can be useful with compiling additional OpenFOAM programs that use FOAM_USER_APPBIN, FOAM_USER_LIBBIN for their build, to avoid conflicts with the normal user bin/lib files. - or to force relocation of FOAM_SITE_APPBIN, FOAM_SITE_LIBBIN during packaging of OpenFOAM
Misc. tools, scripts, templates that are useful (eg, for building applications) but don't need to be in the PATH.