Because RGraph (http://www.rgraph.net/) license is Creative Commons and WordPress.org requires all code in the WPORG repository to be GPLv2 (or later) compatible, which Creative Commons is not, I have created this repostory here.
Remember to add the link to RGraph in your site to comply with it's license.
"Creative Commons Attribution license - you don't need to buy a license - just link to the RGraph website on your site"