Surge XT - Open-source subtractive-hybrid synthesizer formerly sold commercially as Vember Audio Surge.
ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
VHS Synth - The leading free & open-source iOS/macOS music & audio dev tools. https://t.co/Ik1FiorZWH proudly powers millions of iOS app installs
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
cassini - Polyphonic Synthesizer for iPhone/iPod touch
zMors Modular - Full featured modular synthesizer for iOS