eMail: wolfgang.globke @ univie.ac.at
A collection of concise lecture notes on selected topics in differential geometry. Very solid, all the fundamentals and the most important advanced topics are covered. The notes are written on a high level and somewhat demanding, though.
Milne provides a number of terrific books online. Topics are related to algebra, algebraic geometry, Lie groups and number theory.
Great collection of mathematicians' biographies hosted by the University of St Andrews.
A huge collection of ancient, medieval and renaissance mathematical texts in classic Greek, Arabic, Latin, English and German. Includes (among many others) the works of Euclid, Archimedes, Al-Khwarizmi, Newton, Kepler and Gauß.
Ongoing project to collect the complete works of eminent contemporary mathematicians online.
Collection of various articles and documents concerning theoretical physics, mathematics and climate science.
The Internet Archive was founded to build an internet library. Its purposes include offering permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format.