Because DOTA made my life meaningful...
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Steve Feak (AKA Guinsoo),then Eul improved dota,then after.. icefrog is now developing dota
The original map variant was created by Eul, but he did not update the map. Steve "Guinsoo" Feak, would later create a version and update the map for 2 years, then handed the project off to Icefrog who has been working on Dota since 2005.
Valve Corporation.
Dota is a custom game created using the warcraft 3 world editor. If you want to edit dota, you need to purchase warcraft 3. Dota is a protected map, you can not edit it!
There are a number of places where someone can access a free DotA map. Some website examples include Get DotA, DotA-Utilities, Softpedia and DotA Source.