iGrapher is a free web-based financial market visualisation tool for charting, analysis and prediction of different stock, currency and commodity markets. It uses canvas to draw the graphs of financial data.
To use, make some selections from the right hand menu and iGrapher will draw a graph comparing each selection. Hovering over the graph, you can find out the value of each of your selections on the highlighted date. You can expand the timeframe using the scrollbar at the bottom.