Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Jules Verne
Andre Norton
Harry Harrison
Owen Chase
E. E. Smith and Lee Hawkins Garby
John Jacob Astor
E. E. Smith
Philip K. Dick
Various
Poul Anderson
Charles L. Fontenay
Richard M. Elam
Carey Rockwell
Ray Bradbury
Gordon R. Dickson
Randall Garrett
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.