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The General Relativity Tutorial
This note provides an informal introduction to that beautiful and amazingly accurate theory of gravity called general relativity. The goal is to explain the basic equation in this theory - Einstein's equation - with a minimum of fuss and muss.
Author(s): John Baez
NA Pages 
General Relativity Lecture Notes by Ulrich Sperhake
The contents of this lecture notes are : Preliminaries, Differential geometry, Physical laws in curved spacetimes, The Schwarzschild solution and classic tests of GR, Cosmology, Singularities and geodesic incompleteness, Linearized theory and gravitational waves.
Author(s): Ulrich Sperhake
153 Pages
Notes on Relativity and Cosmology
This book explains the following topics: Space, Time, and Newtonian Physics, Maxwell, E and M, and the Ether, Einstein and Inertial Frames, Minkowskian Geometry, Accelerating Reference Frames, Dynamics, Relativity and the Gravitational Field, General Relativity and Curved Spacetime, Black Hole, Cosmology.
Author(s): Donald Marolf
NA Pages
Theory of Special Relativity by Nadia L. Zakamska
This note covers the following topics: Principle of Relativity, Lorentz transform, Simultaneous events, causally connected events, Addition of velocities, 4-vectors: velocity, energy-momentum, Energy-momentum of photon, Doppler effect, aberration, Relativistic dynamics, Electromagnetic fields in different frames.
Author(s): Nadia L. Zakamska
101 Pages
This book covers the following topics: The Electrodynamics of Moving Bodies, Principle of Relativity, The Generalised Principle of Relativity.
Author(s): Albert Einstein
272 Pages