Path of Exile is a free to play, massively multi-player, Action RPG. Path of Exile bears resemblance to other games of its genre, like Diablo and Torchlight.
Path of Exile is the dark fantasy world of Wraeclast, an island for the condemned. Players can choose one of six character classes specializing in one or two core attributes: Dexterity, Strength, and Intelligence.
Path of Exile is well known for its massive passive skill tree, which determines the skills of the different classes by unique starting points on the tree.
The game is planing to have a micro-transactions style business model. Otherwise you can just download the client and play, no need for credit card, etc...