Heroes of Newerth or HoN is a game just like DotA (many people calls it a total rip off).
It has the same map layout, items (price + stats), almost the same heroes as DotA.
difference? it's on it's own game engine with own match making, anti-leaver systems.
not to mention cutting edge graphics.
HoN, LoL (league of legends), Demigod..these three games are/will be much like dota.
you can view a comparison video of these games here: