Browser-based. A browser-based graphing calculator tool. The interface is similar to Grapher for Mac. It is an easy-to-use, free alternative to expensive graphing calculators. There is also an app version of Demos for the iPad.
Windows, Mac, and Linux compatible. Draw flow charts, networks, and diagrams. Can add diagram labels (including Greek characters and mathematical symbols) using HTML. Diagrams can be exported in several raster and vector file formats.