Doubt: A History (//http://) - Jennifer Michael Hecht
Humanist Texts (http://www.humanistictexts.org/)
The History of Freethought and Atheism (http://www.positiveatheism.org/india/s1990c25.htm)
A History of Freethought (http://www.atheistfoundation.org.au/history.htm)
Famous Atheists and Doubters of History (http://www.atheistbible.net/articles_current.html)
Carvaka (http://www.humanistictexts.org/carvaka.htm)