FourHead was developed for the 2021 KVR Developer Challenge, which is currently in the voting stage. It isn’t really a delay or granulator, though it lives in that realm. It’s based on an audio buffer which constantly records the input in chunks. This buffer is then read by four “play heads” which play it back as looped segments.
More info can be found on the VST page or the product page at KVR, where it can also be downloaded.
You must be a member of the KVR forums to vote, but anyone can download the entries.