Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Charles Bradlaugh, John Watts, and active 19th century Anthony Collins
John E. Remsburg
Lewis Henry Berens
M. M. Mangasarian
J. M. Robertson
baron d' Paul Henri Thiry Holbach
These books are free to read. Each is in the public domain in the United States; check your own country's rules before you copy or share one.