Wii Transfer wouldn't exist without the work of so many other Mac developers and open source projects. All the credits are listed in the about box, and licenses that require or suggest that the full agreement be included with the application are also here in the help.
LGPL - for FFmpeg and LAME
movtowav - by Johan Lindström
UKKQueue - by M. Uli Kusterer
Flected - by Jeff Ganyard
NDAlias - by Nathan Day
SmallSockets - by Steven Frank and Rainer Kupke
SourceListTextCell - by Matt Gemmell and Dave Batton
CTGradient - by Chad Weider
RoundedBox - by Matt Gemmel