What are some good visualization libraries for online use? Are they easy to use and is there good documentation?
RaphaelJS can do some pretty amazing stuff and it just got some major backing from Sencha (formerly ExtJS). Raphael is pretty smart about browsers by using a VML backend for Internet Explorer and SVG for everything else. However, the library is pretty low-level. Fortunately, the author has started another project, gRaphael, that focuses on drawing charts and graphs.
- http://insideria.com/2009/12/28-rich-data-visualization-too.html 28 Rich Data Visualization Tools
- http://www.rgraph.net/ R graph
There are hundreds of them. Here is a useful review of some twenty of them: http://bigdata-madesimple.com/review-of-20-best-big-data-visualization-tools/
I would recommend ChartJS, it's simple, beauty and well supported.