Cumulus is available from the physical DVD version of Computer Music Magazine.
It's a granular sampler, run by a sequencer. The sequencer has 8 playable scenes, you can play one scene at a time. Each scene is a location within the sample, plus 12 parameters such as pitch, speed, size and jitter.
I really like the user interface, there's a different color for each scene, and you can easily see how the sequence proceeds through the scenes.