I just heard about the Kickstarter campaign of “Shards Online”, which seems especially appealing to those with an Ultima Online Freeshard background. “Shards” core feature seems to be providing a platform for player-run servers (shards) that can be combined to (as well player-run) clusters, where the players can roam freely around from server/shard to server/shard. The rulesets of each server/cluster should even be “moddable” by the respective players/admins.
I don’t guite get it how this can be achieved with Unity, without having the players/admins to use Unity themselves. Especially the ability to develop individual rulesets by the players/admins for their shards/clusters surprised me. I wasn’t aware that this is even possible with Unity.