FDL or simply GFDL) is a copyleft license for free documentation, designed by the FreeSoftwareFoundation (FSF) for the GNU project. It is the counterpart
OSGeo runs an annual international conference called FOSS4G – Free and Open Source Software for Geospatial. Starting as early as 2006, this event has drawn
projects", Wikimedia Foundation. Retrieved on 2007-01-24 Richard Stallman. "The Free Encyclopedia Project", FreeSoftwareFoundation, 1999. Nupedia Wikipedia