I had a couple of those. (Well, still do – but not using them for anything now. Mine are the ones with 16 cores, that I got for backing them on Kickstarter when they did their original crowd funding) And I was wondering the same a while ago. This guy that was part of Adapteva, makers of Parallella, is working on some ASIC stuff now it looks like.
https://scholar.google.com/citations?user=qdDUg48AAAAJ&hl=en
And since Adapteva website also says: “Adapteva is now Zero ASIC”, I guess maybe some other people that were originally doing the Parallella thing are now doing ASIC things with that guy too.
The Parallella website is still up.
And you can download the old Ubuntu images for the Parallela SBC from the GitHub releases. But they stopped adding anything new to it years ago.