ChannelMaker is a cross-platform application writen in Python to edit WAD channels and create homebrew channels. ChannelMaker is legal and can create completely legal channels, as long as the channel edited was created with homebrew tools (such as Benzin).

ChannelMaker is available as a Mac DMG, a PC installer, and a Linux package.

http://www.wiibrew.org/wiki/ChannelMaker