What are some alternatives?
Pure Data - Pd (aka Pure Data) is a real-time graphical programming environment for audio, video, and graphical...
Sonic Pi - Sonic Pi is a new kind of instrument for a new generation of musicians. It is simple to learn, powerful enough for live performances and free to download.
Vvvv - vvvv is a graphical programming environment for easy prototyping and development.
ChucK - A strongly-timed, concurrent, and on-the-fly audio programming language
Vuo - Design and build live interactive media.
VCV Rack - A cross-platform modular synthesizer.