Planet Explorer - Interactive global satellite images
Giada - Giada is a free, minimal, hardcore audio tool for DJs, live performers and electronic musicians.
Hum - Songwriting for iPhone
Loopy Pro - Loopy, the sophisticated, tactile live looper app that reinvents iPhone and iPad music making.
Tape It - App for songwriting & audio recording.
Group the Loop - Live Looping with usefull GUI, Verse/Chorus layer system, drummer, effects, etc...