Helio - Design successful products by revealing key user behaviors
ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
ArtBeats - A simple musical sequencer built to have no barrier to entry
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
Soundbow - Create music by drawing curves over the screen.
cassini - Polyphonic Synthesizer for iPhone/iPod touch