Description from the site...
Wii FreeLoader is really easy to use. Simply insert your FreeLoader disc and load it in the usual way. When the drive stops, eject the Wii FreeLoader disc and insert the game, which then loads and plays just like it would on its own region of Wii. It’s as simple as that!
Wii FreeLoader is 100% unofficial, but as it requires no modifications to your console, it does not invalidate the warranty. As well as letting you play Wii games from all regions, Wii FreeLoader also works with imported GameCube games when played on your Wii. It won’t work in a GameCube console, though – for that, you need Freeloader for GameCube, also available from Codejunkies…