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This site expains the mathematics behind images, and occasonally supplements with applets, animations, or teaching materials. Still a little sparse, but what is there is well done.

An online tool that graphs multiple functions. Graphs can be linked to by URL, or downloaded as images (for use in tests/worksheets!). Can adjust window and zoom, but can not yet change graph/grid colours and scale is at the edges of the window rather than on the axes. Still in development, so may have features added in the future.

A full featured free online file format converter. Is this too good to be true? It looks safe and legitimate. Works to convert youtube to wmv to include in PowerPoint documents, and a whole lot more.