Siren Audio launched the Lorelei suite of applications a few years ago but now two of them, Generative and Feedback 2 have received major tweaks and updates.
Combining multitimbral sample playback, loop tempo matching, synthesis, multi-effects and an 8GB sound library, is Plug Sound Pro the only software sound source you need alongside your DAW?
Anarchy Rhythms is a novel VST plug-in/stand-alone application, whose author accurately describes it as "a hybrid between an effect and a drum machine".