This is not a bad place to start, especially because they also do ratings:
https://www.topcoinrating.com
I am very much interested in Fintech (Ripple, Stellar...) and Supply Chain Management applications (Vchain, Modum, Ambrosus...), seem like good places for blockchain technology to provide added value.
But also Civic, Golem, Walton, Hive and Elixir for instance to name a few less well known projects.