Modular-based software that people can build their own synthesizers or audio effects. Also this provides a number of presets.
I followed a tutorial about building a simple synthesizer.
Structure of simple synthesizer
Controller of simple synthesizer
Recorded music
2. Ableton live + VST plug-in
I downloaded VST plug-ins from KVRaudio.com. I didn't know which one is good or not. So I downloaded Top-5 audio effect plug-ins and tested them at Ableton live.
My favorite plug-in is 'Glitch'. It is easy to make rhythm and has nice UI.
I recorded circuit music which plug-in was adapted.
3. Grand VJ
I roughly played with GrandVJ, of course I'm not going to use this in this project. But it was helpful to understand the structure of sound interaction stuffs.