Here a choice of forums for Kadett-B & Olympia-A
 

The KadettB.de - Ur-Forum (or simply THE Forum, since 2004, back since 10/2014)

The last active Forum: the Kadett-B-Forum.de, since 2013

The Interim-Forum of Christian (Smeagol) - since  2007

The Urur-Forum (out of the Internet-Stone age in Board structure, since 2001)
doesn’t work anymore, only listed for historical reasons.