I need to draw a graph of measurements of time for a ball to drop on an inclined plane, with error bars, along with lines of best and worst fit. The problem is that I need to do this on the computer and I am unsure about what graphing package I can use to do this and how to go about doing it. I have access to Wolfram Mathematica 7, but I'm unsure about graphing points with uncertainties.
In particle physics the core tool for this purpose these days is ROOT (a few years back there were still a significant number of people using PAW (part of CERNLIB)). Both of these choices suffer somewhat from being big, heavy tools to install just to get some graphing done---we use them because they are primarily the environments in which we did analysis.
A lighter and less specific (but still surprisingly capable) tool is gnuplot.