I am a geodesist working mainly on National Reference Systems in Africa where I have recently spent 5 years. I use Fedora Core as the operating system of choice for the computational power associated with large systems and moderate amounts of data. It is also readily installed elsewhere. My heavy lifting code is Fortran. Much of this is historically driven. Now there is some emphasis to maintain cross platform and operating system compatabality. I write most of my reports using LATEX although small daily contact is with Open Office. ©