Modding
As did Warcraft II and StarCraft before it, Warcraft III ships with a "World Editor" program that allows players to create their own custom scenarios and maps. The World Editor has features such as unit editing and event triggers. Through Battle.net, players can download and play peers' custom maps. To facilitate modding, third-party developers released tools for spell editing through SLK spreadsheets, customizing skins with .BLP converters, JASS editing, and a file importer that opened up .MPQs. The World Editor was expanded and improved for The Frozen Throne expansion. Though the editor has received updates through game patches, it is not officially supported as a product.
Huge communities have also formed; one of the bigger ones is the Koei Elite Gaming, which is based on the Dynasty Warriors franchise. Some custom maps have enjoyed great success, particularly maps based on AoS (Aeon of Strife) such as Defense of the Ancients, which became a tournament item at BlizzCon 2005 and other tournaments around the world.. Various new types of games have been created included Role Playing and Tower Defense maps.
Read more about this topic: Warcraft III: Reign Of Chaos