The latest release of D2 (diva-r22043) includes a few new addons that are missing from the core of OpenSim, namely: Groups, Offline IM and a Terms of Service feature. I’ve waited this long to implement these, but it has finally come to a point that I can’t live without them. Groups are pretty important for access control and permissions, and it has been a battle to work without them; offline IM is convenient; and showing a Terms of Service agreement has become important to me, especially for foreign visitors.
D2 is meant to be a personal virtual world server, so some of these addons have limitations that reflect the spirit of a personal virtual world. For example, in D2 you can create at most 2 groups. I have an unlimited version of Groups, too, but that is meant for larger worlds.
Anyway, you can find all the information about these addons here. The Wifi web app has been extended with some minimal support for managing groups.
These addons are works in progress, and I will keep improving them. This is their first release to the public, so expect some hickups. Please report those issues here, but make sure to read the documentation first.