I find Dgraph to be one of the most interesting of the current batch of non-relational data stores.

I've wanted a robust, easy-to-use graph database for years (ever since reading about the crazy brilliant graph database stuff that goes on inside Facebook https://www.facebook.com/notes/facebook-engineering/tao-the-... ) and Neo4J never really cut it for me.

Watching Dgraph mature - and survive two rounds of Jepsen with relatively decent marks - is intriguing. I don't have a project that needs it yet but maybe something will come up soon.