Some general groups can be found here.
There is a new Internet Only version of STARnet Digital Server which can be run on an Internet connected computer without any repeaters attached. This is ideal to place groups in hardened locations like a data center. The executable and source can be found in the ircDDBGateway packages.
A recently added feature allows a STARnet Digital Group to mirror to and from a DEXTRA reflector (e.g. XRF001 C) to help expose more users to STARnet Digital.