Here is a free web-based graphing tool from the National Center for Educational Statistics. It’s called Create A Graph.
Pick at graph type: bar, line, area, XY, pie
Enter your data
Provide labels and select fonts/sizes
Preview
Print or Save to a file
There are many file formats available: PDF, SVG, PNG, JPG, EMF and EPS.
One of my students is using this site to introduce elementary students to graphing concepts. It is a nice alternative to Excel, especially with younger students.