Information Related to the Various Screen Readers

Screen Reader Website Free / Commercial
Non Visual Desktop Access (NVDA) http://www.nvda-project.org/ Free
System Access To Go http://www.satogo.com/ Free
Hal http://www.yourdolphin.co.uk/productdetail.asp?id=5 Commercial
JAWS http://www.freedomscientific.com/jaws-hq.asp Commercial
Supernova http://www.yourdolphin.co.uk/productdetail.asp?id=1 Commercial