Heroes of Newerth is a game created by S2 games that literally takes DotA All-Stars body and soul from the Warcraft 3 engine to it's own engine not restricted by Blizzard Entertainment.
Icefrog commented on the issue of a game copying DotA with this statement:
They contacted me a few years ago to ask if I had any objections to them doing a game heavily based on DotA, which I didn't. I don't really mind all these new games (6 total now I think), competition is a good thing in the long run. I will still work hard to develop and improve DotA on WC3 for everyone that is still interested in it.As you can see in the screenshot below, HoN is DotA All-Stars 2.0.
Official Heroes of Newerth website: http://www.heroesofnewerth.com
Beta keys? Anyone?