Heroes of Newerth is an upcoming DotA Based Game developed by S2 Games.

S2 has announced that the game will be supported on multiple operating systems, including Windows, Linux and Mac OS.

The game comprises two factions that battle against one another in every game. The factions, the Hellbourne and the Legion, offer players a wide variety of unique heroes that the player controls in the game[6]. The heroes of each faction are organized into three categories; strength heroes, intelligence heroes, and agility heroes.

Reference : HoN wiki
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Basically, A new updated remake of DotA
Currently in Beta although if you purchase the game you can play the beta and referr others.
If anyone wants a referal code please ask me on this thread and i'll get back to you asap (:

Heroes of Newerth