Well... I think the question is, after examining the "7 commandments" of project choosing... how many (and which?) projects are there left?

Seti... Primegrid... Yoyo... Moowrap... anything else?

Some rules are a bit vague to say the least... for example, how many are "just a few operating systems"?... or what constitutes a "buggy application"?
There could be a lot of debate over the interpretation of those rules, but for speeding up this process I throw my 4 above listed projects as my quick vote. Primegrid for GPU, the others CPU.