Open source user tracking on the iPhone

I would like to track certain actions (e.g. how often an app is used) without us开发者_开发百科ing solutions from companies such as Pinch Media or Admob.

Do you know any open source project, which I could use as a starter for my own system?

Check these guys out: http://www.appads.com/

I think you can probably just use this, which is open source, with your own server: http://docs.appads.com/Open_Ad_Integration rather than using their service (which is limited beta anyway and may not be available to you).