List of organisations supporting Free Software (even if they not call it that way)
South East Europe: http://oneworldsee.org/
OSEPA (Open Source Software in European Public Administrations)
Internet Society Bulgaria (ISOC) is a non-governmental organization for public profit, incorporated in Bulgaria in 1995.
FOSS project: Support to e-government initiatives at local (municipality) level through Free and Open Source Software (FOSS) in South-Eastern Europe
There is a separate list for Croatia
LiSoG - Linux Solution Group (Schweiz und Österreich)
GNU Generation (fr)
International Open Source Network The International Open Source Network (IOSN) is a Center of Excellence for FOSS in the Asia-Pacific Region.