Apps similar to ORCA include VCV Rack, which is free and open source. Other options are Pure Data, SunVox, Vuo and SuperCollider. Music Production Apps like ORCA are a crowded field, with more than 25 alternatives for Windows, Mac, Linux, Android and iPhone.
Beast is a digital synthesizer and music creation system, released as Free Software under the GNU LGPL-2.1+. It has support for Linux Audio Plugins (LADSPA), multi-track editing, unlimited undo, real-time synthesis, MIDI and various audio formats like WAV, AIFF, Vorbis...
"Looking for wobble? Look no further. The new Wob FX Max for Live device, developed by Ernesto Cecco D'Ortona, should take care of most if not all of your wobble needs."
