SynthEdit!

Interactive visual programming environment for music, audio, and media

FlowStone is a powerful, graphical programming tool that greatly expedites development with an intuitive and easy-to-use, live programming environment. It's uses extend to education, robotics, data acquisition, image and digital signal processing, home automation and much more.

SonicBirth is a visual design software for building Audio Unit plugins. It can be used both as a host within other DAW apps and as a tool to build and export plugins. It also comes bundled with compressors, reverbs and other plugins as well as pre-constructed circuits to help users build new creations of their own.