Hmmm... It could also be one of those multiple front things. An EE game, an MMO expansion, and a D&D book that is many things plus a planescape setting sorta like scag was.
In the HTML source, there is this snippet:
secret="0x50 0x53 0x54 0x45 0x45"
These are hexadecimal codes for ASCII letters, which converts to PSTEE.
So... it indeed seems to be about Planescape: Torment EE.