Project 1999's servers are just a few of dozens of servers that are based on the work done on EQEmulator, an open source project. Project 1999 makes use of EQ Emu's login servers, which is why you see all those other servers in the servers list when you login.
If you want more info on the other servers, check out EQEmulator's website and server list:
http://www.eqemulator.org/index.php?pageid=serverlist