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.
This Add-In for MS Word and MS One Note integrates many features of Microsoft Mathematics with microsoft's equation editor (Word 2007 and 2010). Most importatnly it produces attractive graphs which would be great for test preparation, but while it has several controls for window, scale, etc., I have not found any for line thickness or colour. Work around this by converting graphs to greyscale, increasing contrast, and decreasing brightness via Picture Tools > Format after inserting a graph.