At ScreenReader.net we have freeware for blindness and visual impairment special needs throughout the world. It is free only to individual blind people for their personal use at home: it is not free to organisations.
"if you get a group of 100 people online then one will create content, 10 will "interact" with it (commenting or offering improvements) and the other 89 will just view it."
the various programs are on many topics of media and mass communications; available in audio, video, or print format; good overview of contemporary media issues by academics and practitioners
M. Duelli, T. Hossfeld, and D. Staehle. Seventh IEEE International Conference on Peer-to-Peer Computing (P2P2007), page 177--184. Best Student Paper, Galway, Ireland, (September 2007)
L. Francisco-Revilla, and J. Crow. HT '09: Proceedings of the Twentieth ACM Conference on Hypertext and Hypermedia, New York, NY, USA, ACM, (July 2009)