Laxmi Bachanalaya
Legally available public-domain books and openly licensed reading materials.
Benedictus de Spinoza
Joshua Rose
Petrus Ramus
David Hilbert
John Dee
Stephen Leacock
Albert Einstein
David Eugene Smith
W. W. Rouse Ball
J. Malcolm Bird
Jean-Henri Fabre and Louise Hasbrouck Zimm
Bertrand Russell
Derrick Norman Lehmer
René Descartes
Henri Poincaré
Simon Newcomb
N. J. Lennes and H. E. Slaught
John Phin
Emil Weyr
Various
Bernhard Marks
Claude Fayette Bragdon
Lewis Carroll
Augustus De Morgan
Julian Lowell Coolidge
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.