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General Science 
Learn Physics Today Online Biology Book
Newtonian Physics (Ben Crowell) [Mirror] [PDF] Lessons In Electric Circuits (T.R. Kuphaldt)
Structure and Interpretation of Classical Mechanics (G.J. Sussman and J. Wisdom)
The Chaos Hypertextbook (Glenn Elert) Immunology Overview (A.S. Goldman, B.S. Prabhakar)
A Radically Modern Approach to Introductory Physics (by D.J. Raymond)
Relativity, The Special and General Theory (A. Einstein) A New Kind of Science