JaxoDraw is a tool to generate Feynman diagrams in a mouse click-and-drag fashion. Graphs can be exported to a variety of graphics formats and arbitrary latex code can be used for labels to produce high-quality publishing-style figures.
NoteLab is an advanced "digital notebook" specifically designed for tablet computers. With its stroke smoothing, antialiasing, and "smart rendering," NoteLab provides a beautiful and powerful note taking environment on any operating system.
JPlot is a multi-purpose data plotting program for use as the graphic front-end of (scientific) software. JPlot is also available as a stand-alone application with a complete and easy-to-use graphic user interface (GUI).