Alexandre Stefanov has long maintained a list of online math texts and other materials at Geocities; this material has now been moved to 110MB Hosting. Because these resources may be of interest to our readers, we present here a modified version of Stefanov's list as of November 18, 2009.

Differential Geometry

• Introduction to Tensor Calculus and Continuum Mechanics, by John H. Heinbockel
• Topics in Differential Geometry, by Peter W. Michor.
• Natural operations in differential geometry, by Ivan Kolar, Jan Slovak and Peter W. Michor
• Intrinsic Geometry of Surfaces, by A. D. Aleksandrov and V. A. Zalgaller
• An Introduction to Riemannian Geometry, by Sigmundur Gudmundsson, Lund University
• Riemann Surfaces, Dynamics and Geometry, by Curtis McMullen
• Invariance Theory, the Heat Equation, and the Atiyah-Singer Index Theorem, by Peter B. Gilkey
• Differentiable Manifolds, by Mariusz Wodzicki
• Lecture notes for the course in Differential Geometry, by Sergei Yakovenko
• Symplectic Geometry with an Eye Toward Combinatorics, by Sue Tolman
• Differential Geometry and Physics, by Gabriel Lugo
• Differential geometry reconstructed, by Alan U. Kennington
• Course of Differential Geometry, by Ruslan Sharipov
• A Modern Course on Curves and Surfaces, by Richard S. Palais
• Undergraduate notes on Projective Geometry, Manifolds etc., by Nigel Hitchin
• Vector Bundles and an Introduction to Gauge Theory, by Steven Bradlow, (Hung-Jen Hsu and Chris Willett)
• Twistor Geometry and Gauge Theory, by Martin Wolf
• Complex Geometry of Nature and General Relativity, by Giampiero Esposito
• Geometric Asymptotics, by Victor Guillemin and Shlomo Sternberg
• Projective Geometry, by Balázs Csikás
• Differential Geometry, by Balázs Csikás
• Projective and Polar Spaceas, by Peter Cameron
• Transformation groups for beginners, by S. V. Duzhin and B. D. Tcherbotarevsky
• Cartan's Corner, Differential geometry & Topology