NVDA is an open source screen reader.
Get NVDA plug-in's from http://stormdragon.us/nvda.
Get information about scripting for NVDA from http://www.webbie.org.uk/nvda/.
Get information about how to install components such as voices and plug in's from http://homepages.slingshot.co.nz/~hurrikenny/how%20to%20install%20additi....
With the 2012, release 2 version, NVDA has incorporated add-on's which replace plug-ins. Plug-ins will be phased out at some point. Check this useful page for add-ins. http://dev.unreliabledevice.net/software/nvda-addons/
You can get a growing list of add-ons from this page at the home of NVDA. http://addons.nvda-project.org/
To buy Vocalizer for NVDA, please contact one of the following channels:
A T Guys:
Computer Room Services:
go to the heading that says vocalizer