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An online graphing calculator with great visual presentation. Nice thick lines for projection. Implicit graphing. Easy tracing. Mulitple functions (and relations!) graphed at once. It looks like this tool is under ongoing development, and a committment to remain free. This one is a keeper.

I found it difficult to enter the equations, the keyboard keeps disappearing and keeps blocking the equation. Any hints..?

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.

Graphs of different types of data broken down by topic. Could be used to discuss representing (and misrepresenting) data in MDM, graph reading or percents and ratios in grade 9 courses

Interactive factoring help for trinomials and difference of squares. Also equations and graphing

Microsoft Mathematics is a free graphing calculator and CAS for windows. It has an equation solver that shows a step by step process, and in my quick test it also gives restrictions on solutions. Will integrate and differentiate expressions, work with matricies, and more.

Online chart generator. May be suitable for proportions in grade 9 applied

Project on blackboard. Trace/Connect max/min points with a smooth curve. Measure successive heights. Determine the rate of decay. Find the correct exponential decay function. Use graphing software to superimpose the function they find on top of the function draw on the board. Change parameters and repeat process. Could be worthwhile.