The List
This is a list I've compiled to highlight community projects that have successfully revived formerly dead online games (so no ongoing games like World of Warcraft), or at least have made enough progress to have something to show and are still in active development.
It is also split into two parts: 'Online-Only Revivals' which are games that require a connection to a server to play at all, and 'Online-Service Revivals' which are games that only require a server for certain features (e.g. online multiplayer), though the list is primarily for the former.
If anybody have any suggests or criticisms, or knows of additional games I should add, please share.