Free Textbooks in Mathematics: General Mathematics
The following is a list of links to useful textbooks in mathematics, available for free on the Internet. All books are legally safe to download:
Elementary mathematics, Analysis, Lebesgue Integrals ..

 Whiteman college, Community Calculus Website
 A Summary of Calculus Prof. Karl Heinz Dovermann
 Basic Concepts of Mathematics by Elias Zakon
 Mathemaics 1 Lecture notes: first year Calculus
 Mathematical Analysis I by Elias Zakon
 Calculus by Gilbert Strang, also Student Study Guide to Calculus and Instructor’s Manual
 Basic algebra and trigonometry. by Thomas Ward
 A first analysis course. by John O’Connor
 First Year Mathematics, (notes by William Chen)
 Multivariable Calculus by George Cain & James Herod
 Complex Analysis by George Cain
 Elementary Linear Algebra by Keith Matthews
 A First Course in Linear Algebra by Robert A. Beezer (GNU Free Documentation License)
 Real Analysis by Prof. William F. Trench
 MEASURE THEORY by Prof. D.H.Fremlin (University of Essex) plain tex sources
 Complex Analysis by Douglas N. Arnold
 Real Analysis for Engineers by Erhan Cinlar and Robert J. Vanderbei
 Set Theoretic Real Analysis by Krzysztof Ciesielski
 Expository notes by Daniel Allcock in The finite reflection groups
 Difference Equations to Differential Equations by Dan Sloughter
 Course of linear algebra and multidimensional geometry by Ruslan Sharipov
 Examples, Lecture Notes and Specimen Exam Questions and Natural Sciences Tripos
 Calculus project of Michael Livshits
 The Matrix Cookbook by Kaare Brandt Petersen
 The Octonions by John C. Baez
 Advanced Calculus by Shlomo Sternber
Mathematical Logic and Set theory

 Mathematical Logic – an Introduction by Michal Walicki
 Set theory by Dr. P. G. Dixon
 Mathematical Logic by Stephen G. Simpson
 Foundations of Mathematics by Stephen G. Simpson
 Model Theory by Stephen G. Simpson
 Computability and Incompleteness by Jeremy Avigad
 Fundamentals of Model Theory by William Weiss and Cherie D’Mello
 Lecture notes in Motivic Integration by David Kazhdan