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.
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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.
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!
You can download dota map 6.82 by visiting the official website dota682.com
Defense of the Ancients, commonly known as DotA, is an Aeon of Strife-style custom map created for the game Warcraft 3. Originally developed for Warcraft 3: Reign of Chaos by Eul (US West), the map was later unofficially ported into the Warcraft 3 expansion pack, The Frozen Throne. Currently, several variants of the map exist under the name of DotA.
http://www.dota-blog.com/2010/05/fix-map-file-is-too-big-on-dota-ai-map.html