I do wish we could get more info on the systems they use. It sounds fascinating. Makes me wish I stuck with computer science as a major.
Elkhan, you might have fun browsing the Ryzom Core
Ryzom Core is the open-source project related to Ryzom Game. Written in C++, Ryzom Core contains the whole code (client, server, tools) used to make the commercial MMORPG Ryzom. Ryzom Core is a toolkit for the development of massively multiplayer online universes. It provides the base technologies and a set of development methodologies for the development of both client and server code.
Poking around in it there isn't anything I see that is super accessible as is, but there is also the Ryzom Core Wiki
that describes some of the systems that make a client-server style MMORPG work.
I've been personally really curious about HeroCloud
, which is the $99/year cloud-based version of the MMO engine
that Bioware used for SWTOR. It might be fun to get some people and fool around with content creation for an MMORPG style thing that totally sucks, but would be also totally educational!