I just noticed that DataGraph has been upgraded to version 3.1

DataGraph is a simple and powerful graphing application for Mac OS X. It is a great companion for Excel, Numbers or any of the big statistical packages. Simple because it is very easy to draw plots, bar graphs, and fit functions. Start typing in data and the graph immediately shows up. Pick from the initial template list and modify the data, change colors, resize easily and interactively.

Included on the page of data analysis tools