• Diagram Designer

From author's site:

Description:

Simple vector graphics editor for creating flowcharts, diagrams and slide shows.
Features

* 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.
* MeeSoft Image Analyzer integration for bitmap image editing and extended file format support.
* Uses compressed file format for minimizing drawing file size.