VisualData is a project mainly written in PHP and JAVASCRIPT, it's free.
Data Visualization Project (MOSS 2011)
A program built in PHP that allows one to read, explore and visualize data from multiple sources. In the present moment it can read data from public spreadsheets and from a Database. Besides that in can show de data read in a graphic (with several types of graphics available) and allows one to filter the data present in the graphics.