Cantabile - Plugin host for live performance.
Keezy Drummer - Make a beat in seconds
Gig Performer - Gig Performer is a cross-platform audio plugin host for live music performances
Sampulator - Make (and record) beats on your keyboard
Blue Cat's PatchWork - Blue Cat's PatchWork is a universal plug-ins patchbay and multi FX that can host up to 64 VST, VST3, Audio Unit or built-in plug-ins into any Digital Audio Workstation (DAW) in a single instance, with both serial and parallel routing options.
Auxy Music Studio - Auxy brings real music creation to iPhone in a simple and inspiring format.