Welcome to the home of the Elemental Titan Campaign <under>.
Game system: D&D 3.5 (Pathfinder rules may be substituted as needed)
World setting: Eberron
Game play: Roll20
GM: Ladygryphon (aka, Demon Chipmunk)
Much of the wiki here will be copy/paste from the Eberron Wiki, complete with links to look for more info. But your best bet is to shell out the bucks for either the PDF, or buy the book like a real gamer. ;)