Sadly the official site is gone now, so the official forum was lost as a communication platform for all Nexus players, modders and mission creators. Many old fansites and community portals have sadly seized to exist as well, so I'll try to collect every remaining even remotely useful link here in this section.
If you're the owner of a Nexus-related site or just happen to know such a site, I'll be glad to add it to this list. Just contact me with the details and I'll get to work rightaway.