ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
triqtraq - Are you a DJ or electronic music producer?
cassini - Polyphonic Synthesizer for iPhone/iPod touch
Figure - Propellerhead creates world-class software products and services that inspire music makers and provide the foundation for a worldwide creative musical community.
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
Wavepot - Wavepot is addictive music or beats maker platform that offers a live-coding environment for creating sound and music.