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Help out$\mathsf{Pr} \infty \mathsf{fWiki}$ is a great resource for mathematical proofs but can not maintain itself. If you want to help $\mathsf{Pr} \infty \mathsf{fWiki}$ expand and grow check out the lists of things below.  
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A selection of links to some other sites which are more or less concerned with Mathematics:
Online Text Books (School Level)
Magazines
 http://plus.maths.org/
 http://isquaredmagazine.co.uk/#
 http://www.maa.org/pubs/mathmag.html
 http://polymathprogrammer.com/singularity/
Forums and Online Communities
 http://www.mathhelpforum.com/mathhelp/
 http://www.thestudentroom.co.uk/
 http://physicsforums.com/ (Mathematics section)
 http://mathoverflow.net/
 http://math.stackexchange.com
 Math is Fun
 Math Is Fun Forum
 Natural Math
 Math Future
 Sangakoo
 Maths Centre for Professional Teachers
Books
 Bertrand Russell and Alfred North Whitehead: Principia Mathematica
 http://wwwcsfaculty.stanford.edu/~knuth/taocp.html
Wikis and Encyclopedias
 Scholarpedia
 ProvenMath
 Subject Wikis
 http://www.tricki.org/
 http://en.wikipedia.org/wiki/Wikipedia:WikiProject_Mathematics
 Math Wiki (on Wikia)
 MathPages
 http://mathworld.wolfram.com/
 http://planetmath.org/
 http://www.mathwords.com/
 nLab
 Art of Problem Solving
 Interactive Mathematics
 Springer Online Reference Works: Encyclopaedia of Mathematics (recently wikified, now using the same technology as $\mathsf{Pr} \infty \mathsf{fWiki}$)
 Esolang (yes I know it's not mathematics)
Blogs
 http://www.mathblogging.org/ (Aggregates from various math blogs)
 http://blog.tanyakhovanova.com/
 http://terrytao.wordpress.com/
 http://wildaboutmath.com/
 http://randmathfun.blogspot.com
 Math Accent
 Bee Bop Parade
 A Quantum Immortal: Stuff Ron Gross finds interesting
 AG from the Beginning: A blog about Algebraic Geometry at an accessible level
 Infinity Series; an introduction to ordinals
 Annoying Precision by Qiaochu Yuan
Software/Computing
 http://www.latexproject.org/
 http://www.w3.org/Math/Software/
 http://pari.math.ubordeaux.fr/
 http://www.gnu.org/software/octave/
 http://www.sagemath.org/
 http://www.texmacs.org/
 http://www.lyx.org/
 http://www.mersenne.org/
 http://www.seventeenorbust.com/
 http://www.geogebra.org/cms/en/info
 http://demonstrations.wolfram.com/index.html
 http://www.rproject.org/
 http://docs.latexlab.org/ (Free online $\LaTeX$ development environment  Requires a Google account)
 http://www.scribtex.com (Free online $\LaTeX$development environment  Good for rapid previews)
 [3]
Comics
 http://xkcd.com/
 http://brownsharpie.courtneygibbons.org/
 http://abstrusegoose.com/
 http://spikedmath.com/
Formalized Mathematical Proofs
 Mizar: "an attempt to reconstruct mathematical vernacular in a computeroriented environment."
 Isabelle
 HOL light
 HOL4
 Coq
 HOL Zero
 ProofPower
 Metamath: A tiny language that can express theorems in abstract mathematics
Computational Knowledge Engines
Lecture Notes
Algebra
Abstract Algebra
 R.B. Ash: Abstract Algebra
 Paul Garrett: Abstract Algebra
 Paul Garrett: Intro to Abstract Algebra (Solutions)
 D. Surowski: A Workbook in Higher Algebra
Linear Algebra
 H. Connell: Elements of Abstract and Linear Algebra
 J. Hefferon: Linear Algebra
 A. Baker: Basic Linear Algebra
 W.W.L. Chen: Linear Algebra
Group Theory
 J.S. Milne: Group Theory
 P. Cvitanović: Group Theory: Birdtracks, Lie's and Exceptional Groups
 Paul Garrett: Buildings, BNPairs, Hecke Algebras, Classical Groups
 R.B. Howlett: Miscellaneous Facts About Coxeter Groups
 Introduction to Group Theory
 A. Baker: Groups and Symmetry
Representation Theory
 A. Baker: Representations of Finite Groups
 C. Teleman: Representation Theory
 P. Etingof, O. Golberg, S. Hensel, T. Liu, A. Schwendner, D. Vaintrob, and E. Yudovina: Introduction to representation theory
Universal Algebra
 G.M. Bergman: An Introduction to Universal Algebra
 S. Burris and H.P. Sankappanavar: A Course in Universal Algebra
 M. Valeritoe: Lectures on Universal Algebra
Lie Groups
 B.C. Hall: An Elementary Introduction to Groups and Representations
 Paul Garrett: Lie Algebras and Lie Groups
 I. Avramidi: Notes on Lie Groups
 R.L. Bryant: An Introduction to Lie Groups and Symplectic Geometry
 A. Cap: Lie Groups
Galois Theory
 J.S. Milne: Fields and Galois Theory
 D. Wilkins: Galois Theory
 A. Baker: An Introduction to Galois Theory
 J.P. Serre: Topics in Galois Theory
 M. Reid: Galois Theory
 S.R. Ghorpade: Notes on Galois Theory
Commutative Algebra
 R.B. Ash: Commutative Algebra
 Paul Garrett: Homological and Commutative Algebra
 D. Murfet: Matsumura: Commutative Algebra
 S.R. Ghorpade: Lectures on Commutative Algebra
Category Theory
 M. Fokkinga: A Gentle Introduction to Category Theory
 M. Bar and C. Wells: Toposes, Triples and Theories
 J. van Oosten: Basic Category Theory
 D. Turi: Category Theory Lecture Notes
 D.E. Rydeheard and R.M. Burstall: Computational Category Theory
Number Theory
 W.W.L. Chen: Elementary Number Theory
 W.W.L. Chen: Distribution of Prime Numbers
 J.S. Milne: Algebraic Number Theory
 R.B. Ash: Algebraic Number Theory
 J.S. Milne: Modular Functions and Modular Forms
 Paul Garrett: Modular Forms and LFunctions
 I.V. Dolgachev: Modular Forms
 J.S. Milne: Etale Cohomology
 J.S. Milne: Class Field Theory
 J.S. Milne: Complex Multiplication
 J.S. Milne: Abelian Varieties
 Paul Garrett: Number Theory
 Paul Garrett: Cryptography and Number Theory
 Paul Garrett: Coding Theory
 A. Baker: An Introduction to $p$adic Numbers and $p$adic Analysis
 A. Baker: Algebra and Number Theory
 I. Connell: An Elliptic Curve Handbook
Geometry
Algebraic Geometry
 J.S. Milne: Algebraic Geometry
 J.S. Milne: Algebraic Groups
 I.V. Dolgachev: Introduction to Algebraic Geometry
 I.V. Dolgachev: The McKay Correspondence
 I.V. Dolgachev: Topics in Classical Algebraic Geometry
 C. Weibel: An Introduction to Algebraic KTheory
Differential Geometry
 B. Csikós: Differential Geometry
 G. Lugo: Differential Geometry
 M. Kazarian: Differential Geometry
 T. Shifrin: Differential Geometry: A First Course in Curves and Surfaces
 D. Zaitsev: Differential Geometry: Lecture Notes
 J.P. Demailly: Complex Analytic and Diﬀerential Geometry
Analysis
Complex Analysis
 R.B. Ash: Complex Variables
 Paul Garrett: Complex Analysis
 G. Cain: Complex Analysis
 H.V. McIntosh: Complex Analysis
 W.W.L. Chen: Introduction to Complex Analysis
Real Analysis
 R.B. Ash: Real Variables with Basic Metric Space Topology
 S. Semmes: Elements of Linear and Real Analysis
 J. Orr: Analysis WebNotes
 I. Craw: Advanced Calculus and Analysis
 W.W.L. Chen: Fundamentals of Analysis
Functional Analysis
 W.W.L. Chen: Linear Functional Analysis
 W.W.L. Chen: Introduction to Lebesgue Integration
 T. Ward: Functional Analysis
 Paul Garrett: Functional Analysis
Differential Equations
Probability and Statistics
 R.B. Ash: Lectures on Statistics
 R.B. Ash: Basic Probability Theory
 C. Grinstead and J. Snell: Introduction to Probability
 N. Vaillant: Probability Tutorials
Complexity and Algorithms
 C. Yap: Fundamental Problems in Algorithmic Algebra
 C. Yap: Introduction to Complexity Classes
 C. Yap: Robust Geometric Computation
 C. Yap: Algorithmics
 W.W.L. Chen: Discrete Mathematics
Combinatorics
 M. Petkovsek, H. Wilf and D. Zeilberger: The Book A=B
 H. Wilf: Generatingfunctionology
 D. Feldman: Ramsey's Theorem and Ramsey Theory
 Dynamic Surveys in Combinatorics
Basic Algebra
 K. Kubota: College Algebra
 D. Joyce: A Short Course in Trigonometry
 T. Ward: Basic Mathematics
 W.W.L. Chen: Miscellaneous Topics in First Year Mathematics
 MathIsFun: College Algebra
Calculus
 G. Cain and J. Herod: Multivariable Calculus
 Harvey Mudd College Calculus Tutorials
 D. Sloughter: Difference Equations to Differential Equations
 P. Dawkins: Paul's Online Math Notes
 W.W.L. Chen and X.T. Duong: Elementary Mathematics
 W.W.L. Chen: First Year Calculus
 W.W.L. Chen: Multivariable and Vector Analysis
Graph Theory
Dynamical Systems
 G. Elert: The Chaos Hypertextbook
 P. Cvitanović, R. Artuso, R. Mainieri, G. Tanner, G. Vattay, N. Whelan and A. Wirzba: Chaos: Classical and Quantum
 J. Milnor: Dynamics in One Complex Variable
 P. Arnoux, V. Berthé, S. Ferenczi, S. Ito, C. Mauduit, M. Mori, J. Peyrière, A. Siegel, J.I. Tamura and Z.Y. Wen: Substitutions in Dynamics, Arithmetic and Combinatorics
 T. Ward: Entropy of Compact Group Automorphisms
 T. Ward: Valuations and Dynamics
Topology
Algebraic Topology
Logic
MIT Online Materials
Other random stuff
Video Media
Uncategorized (Wait...)
 http://www.cuttheknot.org/
 http://nrich.maths.org/public/
 http://www.abstractmath.org/MM/MMIntro.htm
 http://radicaleye.com/lifepage/
 MSC2010
 http://primes.utm.edu/
 Math Reference Project (Webbased notes on universitylevel mathematics.)
 The Online Encyclopedia of Integer Sequences
 Theorem of the Day