My favorite would be QRL (Quantum Resistant Ledger).

I think that the idea of future proof cryptocurrencies will be more and more cherished in the near future, and QRL definitely presents an interesting solution. If they are able to add more functionality like smart contracts etc., launch their project within a short period of time and potentially even rebranding their entire project's name, then I see a lot of potential.

Runner up would be Factom. No idea why it's even out of the top 100 now as it used to be extremely popular.