Online books
General
- Roger D. Blandford (Stanford) and Kip S. Thorne (Caltech), Applications of classical physics
Classical Mechanics
- L.D. Landau and E.M. Lifshitz, Mechanics (Course of Theoretical Physics, Volume 1)
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David Morin (Harvard),
Introduction to Classical Mechanics With Problems and Solutions
Sample chapters, errata, Google books link, additional chapter
- David Tong (Cambridge), Lectures on Classical Dynamics
- Richard Fitzpatrick (University of Texas at Austin), Analytical Classical Mechanics
- John Baez (University of California, Riverside), Classical Mechanics
- Alain J. Brizard (Saint Michael's College), An introduction to Lagrangian mechanics
- Simon J. A. Malham (Heriot-Watt University), An introduction to Lagrangian and Hamiltonian mechanics
Continuum Mechanics
- L.D. Landau and E.M. Lifshitz, Theory of Elasticity
- L.D. Landau and E.M. Lifshitz, Fluid Mechanics
- Simon J. A. Malham (Heriot-Watt University), Introductory fluid mechanics
- Allan F. Bower (Brown University), Applied Mechanics of Solids
- Horace Lamb, Hydrodynamics
- A. E. H. Love, A treatise on the mathematical theory of elasticity
Scientific Computing:
- Cleve Moler (MathWorks), Numerical Computing with MATLAB
- Morten Hjorth-Jensen (University of Oslo), Computational Physics
- Eric Ayars (California State University, Chico), Computational Physics with Python
Mathematics:
- James Nearing, Mathematical Tools for Physics, Dover Publications, 2010.
- Michael Stone and Paul Goldbart, Mathematics for Physics (also here), Cambridge University Press, 2009.
- Herbert Wilf, Mathematics for the Physical Sciences, Dover Publications, 2006.
- Michael P. Brenner, Physical Mathematics, Harvard AM201, 2010.
- Gilbert Strang, Calculus Online Textbook, MIT OpenCourseWare, 2005.