NodeRegator is an utterly simple tool to track basic traffic information across multiple domains. NodeRegator is not a replacement for GA, Piwik, Hummingbird or anything else you think it may be for.
NodeRegator is now split into two pieces. One is a dead simple node.js server that handles page "hits". The other is a PHP (yeah, I know) application that uses the Xoket framework. These can, and should, run on separate servers.
I have a bunch of sites spread across multiple GA accounts, and I want to compare them. Nothing fancy, just really basic information. This started as my quick fix for that, and has grown out of control.