Diagram Designer is a freeware program for creating ‘flowcharts, diagrams and slide shows’. I suppose it could also be used for more exotic stuff like wireframing and the like. It’s Open Source, so the full source code is available if anyone fancies tweaking, forking or generally messing around.
Customizable template object palette. # Spellchecker (see below about dictionaries). # Import/export WMF, EMF, BMP, JPEG, PNG, MNG, ICO, GIF and PCX images. # Slide show viewer. # Simple graph plotter to plot mathematical expressions. # Advanced “pocket” calculator with equation solver.