AlgoScore is an algorithmic graphical sequencer and frontend to CSound where the composer works in an interactive graphical score. Any number of csound instances can be created and take input in the form of events, ftables and control data (through software busses). Each csound instance then renders to audio in a background process, and the audio can be played back throigh JACK or exported to audio file.
AlgoScore is work-in-progress but already quite usable. More information and downloads at http://kymatica.com/algoscore