Swivel is a website where people share reports of charts and numbers. Swivel is free for public data, and charges a monthly fee to people who want to use it in private.
M. Chatti, M. Jarke, T. Indriasari, and M. Specht. Learning in the Synergy of Multiple Disciplines, Proceedings of the EC-TEL 2009, volume 5794 of Lecture Notes in Computer Science, Berlin/Heidelberg, Springer, (October 2009)