A. N. Whitehead's Geometric Algebra by Stephen Blake | A=B by Herbert S. Wilf, Marko Petkovsek, Doron Zeilberger | A Combinatorial Miscellany by Anders Björner, Richard P. Stanley |

A Computational Introduction into Number Theory and Algebra by Victor Shoup | A Computational Introduction to Number Theory and Algebra by Victor Shoup | A Course in Algebraic Number Theory by Robert B. Ash |

A Course in Commutative Algebra by Robert B. Ash | A Course in Universal Algebra by Stanley N. Burris, H.P. Sankappanavar | A Short Course in Discrete Mathematics by Edward A. Bender, S. Gill Williamson |

A Tour of Triangle Geometry by Paul Yiu | A first Course in Linear Algebra by Robert Beezer et al | Abelian Categories by Peter Freyd |

Abstract Algebra: The Basic Graduate Year by Robert B. Ash | Abstract Algebra by David R. Wilkins | Abstract Algebra by Paul Garret |

Abstract and Concrete Categories: The Joy of Cats by Jiri Adamek, Horst Herrlich, George Strecker | Advanced Calculus by Shlomo Sternberg | Algebra - Abstract and Concrete by Frederick M. Goodman |

Algebraic & Number Theory by Andrew Baker | Algebraic Geometry by J.S. Milne | Algebraic Number Theory by J.S. Milne |

Algebraic Topology by Allen Hatcher | Amusements in Mathematics by Henry Ernest Dudeney | An Explicit Approach to Elementary Number Theory by William Stein |

An Introduction to the Theory of Numbers by Leo Moser | Analysis WebNotes by John Lindsay Orr | Analysis of Functions of a Single Variable by Lawrence Baggett |

Applied Analysis by John Hunter, Bruno Nachtergaele | Applied Combinatorics by S. E. Payne | Basic Concepts of Enriched Category Theory by G.M. Kelly |

Basic Concepts of Mathematics by Elias Zakon | Basic Probability Theory by Robert B. Ash | Basics of Algebra and Analysis for Computer Science by Jean Gallier |

Calculus III by Paul Dawkins | Calculus II by Paul Dawkins | Calculus I by Paul Dawkins |

Calculus Without Limits by John C. Sparks | Calculus by David Guichard | Calculus by Gilbert Strang |

Class Field Theory by J.S. Milne | Classical Groups by Peter J. Cameron | Codecogs - Equation Editor |

Coding and Cryptography by T. W. Körner | College Algebra by Paul Dawkins | Combinatorial Algorithms by Herbert S. Wilf, Albert Nijenhuis |

Community Calculus by David Guichard, Neal Koblitz | Complex Analysis by George Cain | Complex Analysis by Harold V. McIntosh |

Complex Variables by Robert B. Ash, W.P. Novinger | Computational Geometry by David M. Mount | Computational Geometry by Jianer Chen |

Convex Optimization by Stephen Boyd, Lieven Vandenberghe | Cookbook of Mathematics by Viatcheslav Vinogradov | Course of Analytical Geometry by Ruslan Sharipov |

Course of Differential Geometry by Ruslan Sharipov | Course of Linear Algebra and Multidimensional Geometry by Ruslan Sharipov | Difference Equations to Differential Equations by Dan Sloughter |

Differential Equations by Paul Dawkins | Differential Geometry: A First Course in Curves and Surfaces by Theodore Shifrin | Differential Geometry by Theodore Shifrin |

Discrete Mathematics by Jean Gallier | Discrete Mathematics by William Chen | Discrete Mathematics for Computer Science by Jean Gallier |

Distribution of Prime Numbers by William Chen | ETC - Encyclopedia of Triangle Centers | Elementary Calculus: An Approach Using Infinitesimals by H. Jerome Keisler |

Elementary Linear Algebra by Keith Matthews | Elementary Mathematics by William Chen, XT Duong | Elementary Number Theory by William Chen |

Elements of Abstract and Linear Algebra by Edwin H. Connell | Elements of Linear and Real Analysis by Stephen Semmes | Entropy of Compact Group Automorphisms by Thomas Ward |

Euclidean Geometry Notes by Paul Yiu | Fields and Galois Theory J.S. Milne | Finite Geometry by Chris Godsil |

Finite Geometry by Jürgen Bierbrauer | First Year Calculus by William Chen | Foundations of Cryptography by Oded Goldreich |

Free Math Sources | Freemath Guidelines | Freemath Wiki |

Functional Analysis Lecture Notes by Thomas Ward | Fundamentals of Analysis by William Chen | Fundamentals of Geometry by Oleg A. Belyaev |

GAP | GCalc | Galois Theory by Miles Reid |

Game Theory by Thomas S. Ferguson | Generatingfunctionology by Herbert S. Wilf | GeoGebra |

GeoNeXT | Geometric Asymptotics by Victor Guillemin, Shlomo Sternberg | Geometry Unbound by Kiran S. Kedlaya |

Geometry and Group Theory | Graph Theory by Reinhard Diestel | Graph Theory with Applications by J. A. Bondy, U. S. R. Murty |

Group Theory by J.S. Milne | Group Theory by Predrag Cvitanović | Groups and Symmetry by Andrew Baker |

Handbook of Applied Cryptography by Alfred J. Menezes, Paul C. van Oorschot, Scott A. Vanstone | Herbert S. Wilf | Information Theory, Inference, Learning Algorithms |

Intro to Abstract Algebra by Paul Garret | Introduction into Logic for Computer Science by S. Arun-Kumar | Introduction into Statistical Thought by Michael Lavine |

Introduction to Complex Analysis by William Chen | Introduction to Finite Geometry by Simeon Ball and Zsuzsa Weiner | Introduction to Lebesgue Integration by William Chen |

Introduction to Logic by Michal Waliki | Introduction to Vectors and Tensors - Vol. 1 & Vol. 2 by Ray M. Bowen, C. C. Wang | J. H. M. Wedderburn |

Lectures on Convex Sets by Niels Lauritzen | Lectures on Matrices by J. H. M. Wedderburn | Lectures on Numerical Analysis by Herbert S. Wilf, Dennis Deturck |

Lectures on Statistics by Robert B. Ash | Linear Algebra, Infinite Dimensions, and Maple by James Herod | Linear Algebra, Theory And Applications by Kenneth Kuttler |

Linear Algebra Done Wrong by Sergei Treil | Linear Algebra by Jim Hefferon | Linear Algebra by Paul Dawkins |

Linear Algebra by William Chen | Logic for Computer Science: Foundations of Automatic Theorem Proving by Jean Gallier | MacTutor - History of Mathematics |

Math.stackexchange.com | Math on freenode (irc) | Math on the efnet (irc) |

Math on the undernet (irc) | Math overflow | Mathematical Ananlysis I by Elias Zakon |

Mathematical Control Theory by Eduardo D. Sontag | Mathematics for Algorithm and Systems Analysis by Edward A. Bender, S. Gill Williamson | Mathematics for Computer Science by Eric Lehman, F. Thompson Leighton, Albert R. Meyer |

Mathematics for Economic Theory by Julio Dávila | Mathematics under the Microscope by Alexandre V. Borovnik | Mathworld |

Matroid Decomposition by Klaus Truemper | Maxima | Microsoft Mathematics |

Multivariable Calculus by George Cain, James Herod | Multivariable and Vector Analysis by William Chen | Noncommutative Geometry by Alain Connes |

Notes on Differential Equation by Bob Terrell | Nrich | Numerical Methods for Electrical and Computer Engineers by Douglas Wilhelm Harder |

Numerical Recipes | Octave | Olympiad Inequalities by Thomas J. Mildorf |

Online Encyclopedia of Integer Sequences | OpenIntro Statistics by David M. Diez, Cristopher D. Barr, Mine Cetinkaya-Rundel | PARI/GP |

Planar Circle Geometries by Erich Hartmann | PlanetMath | Probability Theory by S.R.S.Varadhan |

Probability and Statistics. Explorations with MAPLE by Elliot A. Tanis, Zaven A. Karian | Probability and Stochastic Processes with Applications by Oliver Knill | Probability by Charles M. Grinstead, J.Laurie Snell |

Problem Course in Mathematical Logic by Stefan Bilaniuk | Projective and Polar Spaces by Peter J. Cameron | Proof Wiki |

Real Analysis by Andrew M. Bruckner, Judith B. Bruckner, Brian S. Thomson | Real Variables with Basic Metric Space Topology by Robert B. Ash | Recreational Mathematics by Paul Yiu |

Richard P. Stanley | Sage (Software) | Scilab |

Spherical Trigonometry: For the Use of Colleges and Schools | Springer Encyclopedia of Mathematics | Stanford Encyclopedia of Philosophy |

Statistics for the Social and Behavioral Sciences by David A. Kenny | Stochastic Calculus by Alan Bain | SymPy |

Test | The Calculus Bible by G. S. Gill | The Calculus of Functions of Several Variables by Dan Sloughter |

The Classification Theorem for Compact Surfaces by Jean Gallier, Dianna Xu | The Elements of Statistical Learning by Trevor Hastie, Robert Tibshirani, Jerome Friedman | The Foundations of Geometry by David Hilbert |

The Matrix Cookbook by Kaare Brandt Petersen, Michael Syskind Pedersen | The theory of functions of a real variable by Shlomo Sternberg | Theory and Application of Graphs by Junming Xu |

Topology Lecture Notes by Thomas Ward | Topology Without Tears by Sydney A. Morris | Trigonometric Delights by Eli Maor |

Understanding Algebra by James W. Brennan | Understanding Calculus by Faraz Hussain | Vector Analysis by J. Willard Gibbs |

Wikipedia - Math Portal | William Chen | Workbook in Higher Algebra by David Surowski |

Yet Another Calculus Text by Dan Sloughter |