Once upon a time, it was hard to find easy to use "business" software. Now there seems to be too many packages to choose from. Both Gnumeric and KDE's spreadsheet have basic data charting tools. At the other end of the extreme, IBM's data plotter offers a powerful and extensively configurable 3D data representation tool. In between, there are now plenty of little programs to make all those little images you need for a polished looking paper or presentation.