Major Sketch Pad, created by Kreativt Darhus is a step sequencer combined with a chorder. Each time it gets triggered by a midi note the step sequencer steps forward and each step can contain a new, different chord.
The main idea behind the sketch pad is to make it easier for people who are having a hard time coming up with songs to at least get a "rough" arrangement sketch that they can continue to work with. It is, after all, often the beginning of a song that is the hard part to come up with.
Major sketch pad also have keyboard split between the chord and a solo section. So you can play polyphonic solos upon your chords to see how solo play will lend itself to your arrangement. Quite handy. No, this is not some psuedo-random-crap, you are in control of your music all the time when using the sketch pad. This is an arrangement utility rather than a music production tool.
Download: Kreativt Darhus - Major Sketch Pad