RLPlot is is a cross-platform plotting program to create high quality graphs from data. Based on values stored in a spreadsheet several menus help you to create graphs of your choice. The Graphs are displayed as you get them (Wysiwyg). Double click any element of the graph (or a single click with the right mouse button) to modify its properties.
Mac OS X 10.3 or later, installation of Trolltech's Qt 3.3.x C++ framework (a download link for an installer package is provided with the installation)