An Edudemic article, by Matt Bower, describing some features of many free Web tools – http://net.educause.edu/ir/library/pdf/csd6280.pdf
This article presents the outcomes of a typological analysis of Web 2.0 learning technologies.
A comprehensive review incorporating over two thousand links led to identification of 212 Web 2.0 technologies that were suitable for learning and teaching purposes. The typological analysis then resulted in 37 types of Web 2.0 technologies that were arranged into 14 clusters.
The types of Web 2.0 learning technologies, their descriptions, pedagogical uses and example tools for each category are described, arranged according to the clusters. Results of this study imply that educators typically have a narrow conception of Web 2.0 technologies, and that there is a wide array of Web 2.0 tools as yet to be fully harnessed by learning designers and educational research.