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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.