Inch By Inch is a free Max For Live generative step sequencer that creates gradually evolving patterns with probabilities for changing individual steps and other parameters.
A now free cross-platform MIDI sequencer surfaced as a VST/AU/etc. plugin. More info & download.
There´s a new MIDI controller in town. Well, right now it´s on Kickstarter. 216 parameters can be controlled (editable) and the best thing is there´s a display showing you all concretely. Final price of the Electra One will be €429.
Generate audio in your browser by certain rules with the WoframTones Generator. You can download results in several audio fromats and as well as MIDI files.
This is a nice MIDI controller from Artifon. Not cheap though, 600+. Features:
Play guitar, bass, synth, violin, drum pads, and more, on a revolutionary MIDI controller
TIME Magazine “Best Invention of the Year,” #1 Instrument on Kickstarter, PCMag Editors’ Choice
The first fretted and fretless digital string instrument; low-latency, pressure-sensitive playing
Ultra Portable: Lightweight and 6-Hour Battery Life; USB & Lightning Cable iOS and Mac Connectivity
2 Stereo Speakers & Headphone Jack for creating on your own, or jamming with friends