1. Tezos (not part of ethereum ecosystem) 2. Golem (part of ethereum) 3. Litecoin (they are pioneering the lightning + SegWit protocol first, before BTC, the price could rise dramatically if it's a success) 4. Dogecoin (this one is just fun and has been a cult classic since it came out, don't recommend anyone buying, just fun to add it to the list, much wow)
Disclaimer: I own no position in the above nor am I affiliated with any of them. These are just my opinions.