Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Paulist Fathers
Various
Mary Swain Routzahn
Aleš Hrdlička
George Stuart Fullerton
W. G. D. Fletcher
Paul Carus
John Howell Griffith
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.