Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
Reaktor - Native Instruments Reaktor is a virtual, modular synthesis platform.
Processing - C++ and Java programming at the speed of thought.
miRack - Eurorack-style modular synthesizer for iOS.
TouchDesigner - TouchDesigner is a visual development platform that equips you with the tools you need to create stunning realtime projects and rich user experiences.