I haven't seen these two new CPU-only projects, NERVA and Zettel, listed here. Both use unique hashing algorithims. I apologize if they are already mentioned and I just missed them.

NERVA is about 2 weeks old and uses a variant of the Cryptonight algorithim.  If I understand it correctly, it has 1024 variants that are cycled through.  

Its [ANN] is here: https://bitcointalk.org/index.php?topic=3464367.0

Zettel or ZettelKasten as the larger project is known, uses a variant of Keccak, Keccak512, I believe, but with the addition of  a 'Spread' algo that requires the private key for mining.  It was announced about six or seven weeks ago.

The [ANN] is here: https://bitcointalk.org/index.php?topic=3207356.0