Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
H. G. Wells
Edgar Rice Burroughs
Andre Norton
David Lindsay
Voltaire
Mark Clifton
Stephen Marlowe
Simon Newcomb
Christiaan Huygens
Harry Harrison
E. E. Smith
Jack London
Marion Zimmer Bradley
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.