After I found this very cool and free analytics service Gameanalytics.com, I wanted to use it for my games. The only library to use their API in Haxe wasn't really working, so I made my own.
My HxGameAnalytics library uses their latest API and implements most of their features (though I'm having trouble with some as well, for example cross-platform saving beteween sessions)
And it's open source: Project at Github
Development tools: Haxe programming language