We reviewed the current options at one point (Zookeper, Doozer and something from Netflix) but ended up just using DNS (Route 53) for our config. This however

We reviewed the current options at one point (Zookeper, Doozer and something from Netflix) but ended up just using DNS (Route 53) for our config. This however looks great, and supports nested keys (trees) whereas DNS comes up short in that, and other aspects.