Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Herbert Spencer
Thomas Henry Huxley
Ernst Haeckel
Samuel Butler
Joseph McCabe
Charles Darwin
Agnes Robertson Arber
Rudolf Schmid
Charles Hodge
Asa Gray
Eberhard Dennert
August Weismann
Walter Bagehot
St. George Jackson Mivart
John Burroughs
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.