Kleros 

Decentralized Courts. I really like the idea. Simple & powerful. It's fantastic to have a place where you can easily settle disputes without having to go to actual courts. It fills a gap between actual courts and no courts at all, and crypto & decentralisation protocols are the perfect tools to fill that gap. I personally believe that a lot more solutions like this will emerge soon. Cyrator is a similar solution, using a decentralized network to rate crypto projects. However, I'm giving them 4 stars for now because their protocols feel a little too simple to me. I haven't yet found a clear game changer anywhere in their docs that made me feel this is a genius solution. So it's more like an obvious implementation, which deserves 4 stars. Show Less