I like this list and have been looking into the technologies behind these other coins as well. I also have on my radar, Byteball, Dash, PIVX and Waves. I believe PIVX is a fork of Dash and Byteball and IOTA are similar in their approach of the "tangle."

What interests me is the solutions that these technologies will need to come up with in order to be decentralized, private, have fast transaction speeds, etc. I believe Ethereum is looking into an off chain solution, the Raiden network to speed up transaction times.