Chataigne - Artist-friendly Modular Machine for Art and Technology
232key - Transforms data received via RS-232 into keystrokes. Make your serial device talk to any program!
ossia score - Open-source interactive sequencer for the intermedia arts
TWedge - TWedge enables you to capture data from devices like bar code readers, scanners, decoders, gauges...
Vezer - Timeline-based MIDI/OSC/DMX sequencer for audiovisual artists
NoFlo - NoFlo is a JavaScript implementation of Flow-Based Programming (FBP).