Dop-IOS MOD is a modification of the application Dop-IOS that allows you to choose which IOS you would like to use to install other IOSs (with the trucha bug if you like).
While the original Dop-IOS let you install other IOSs, it used IOS 2491 to do it. As IOS 249 is primarily a piracy IOS (which is in some cases is itself illegal) many people felt a certain resentment toward it's exclusivity on which the authors have no comment.
A better solution for all users would've been to allow users to select which IOS they use to install other IOSs. Enter: Dop-IOS MOD
Since fulfilling it's original purpose, Dop-IOS MOD has brought many new and improved features to it's Dop-IOS base (or "core" if you will) including Gamecube controller support.
Changelog
v4:
Fixed bugs preventing the gamecube controller from working in a couple of places
Many changes (improvements) to the Dop-IOS base