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.
Agna is a freeware application designed for social network analysis, sociometry and sequential analysis. Platform-independent, friendly and easy-to-learn, integrated visual network editor, html output, free.
VisualWikipedia is a visual, intuitive, and interactive web interface to encyclopedic knowledge/information. It is designed to provide a fun place to learn stuff in an efficient manner. Please watch the following video to get a good sense of how to use it.