DARC
Deutscher amateur-radio-club e.v. (darc)
http://www.darc.de/
ARRL
Arrlweb is the home of the american radio relay league, the us national organization of amateur radio operators.
http://www.arrl.org/
AMSAT
Amsat is a worldwide group of amateur radio operators who share an active interest in building, launching and then communicating with each other through non-commercial amateur radio satellites. amsat designs, constructs and successfully launches communications satellites into earth orbit.
http://www.amsat.org/
DARES
DARES
http://www.dares.nl/
IARU
IARU
http://www.iaru.org/
Vlaamse Radio Amateurs
Specifieke en algemene informatie voor de vlaamse radioamateurs...
http://www.vra.be/
NVRA
NVRA
http://www.nvra.net/
ITU
ITU
http://www.itu.int/home/index.html
VRZA
VRZA
http://www.vrza.org/