We built our own and ended up building something somewhat similar to a basic version of KISSMetrics simply because KISSMetrics, and also Google Analytics real-time, doesn't let you pull out data out in real-time (or even poll their API in short bursts - Also we needed to mix in our own data to segment the analytics on a deeper level, and due to our privacy policy, we don't share user data with 3rd party services so it needs to be in-house.