I'm looking for a open source report framework for statistics.

A more detailed explanation is: We have a number of tests running on different servers collecting data (for example, login time) every 5min. What we need is a framework that collects this data (or exposes web services for us to push the data into the framework) and presents it in form of graphs and so on.

Does anyone know of a framework that's easy to use out of the box but has the power to grow? If you know what I mean.

Thanks in advance!