Mathematics
"A scientist worthy of the name, above all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature." Henri Poincaré (18541912) 
Algebra / Calculus / Geometry / Trigonometry /

Algebra 
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Abstract & Linear Algebra: An online textbook concentrating on Linear Algebra.  
Abstract Algebra: An online textbook concentrating on Abstract Algebra.  
Algebra: Homework help for PreAlgebra, Algebra I and Algebra II.  
Algebrahelp.com: Algebrahelp.com is a collection of tools created to assist students and teachers of algebra.  
CuttheKnot: A web site devoted to the deductive science of Mathematics. Learning to appreciate Mathematics, as well as tutorials, is a feature of this site.  
Dictionary of Algorithms and Data Structures: The National Institute of Standards and Technology offers this "dictionary of algorithms, algorithmic techniques, data structures, archetypal problems, and related definitions. Algorithms include common functions, such as Ackermann's function. Problems include traveling salesman and Byzantine generals. Some entries have links to implementations and more information." 

GCalc: is free. It costs you nothing to use it. It is also licensed under the General Public License (GPL), making it free software. You can copy it, distribute it, and even compile it yourself. GCalc is a graphing calculator. Using web technology, GCalc is designed to provide a basic, wellbalanced set of graphing functionality to students and educators alike, all over the world.  
Math Abundance: This site provides upper secondary math tutorials for all math topics.  
Math Archives: — provides organized internet access to a wide variety of mathematical resources.  
Mathematical Atlas: This is a collection of short articles designed to provide an introduction to the areas of modern mathematics and is a pointer to more information, as well as answers to some common questions.  
MathNerds: MathNerds has a strong commitment to inquirybased education. MathNerds provides free, discoverybased, mathematical guidance via an international, volunteer network of mathematicians. MathNerds does not supply answers to homework, take home test, and the like; rather they provide hints, suggestions, and references to help clients understand and solve their mathematical problems.  
Mathworld: A comprehensive and interactive mathematics encyclopedia.  
Purplemath: An easy to search site that concentrates on Algebra but branches out to other disciplines in Math as well.  
SOSMath: This is a resource for math review material from Algebra to Differential Equations. Help for homework, test preparation and just simply refreshing your memory.  
Understanding Algebra: An online textbook for Algebra.  
Webmath: This site has over 100 instantanswer, selfhelp, math solvers, ready to help you get your math problem solved.  
Calculus 
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Automatic Calculus and Algebra: The stated goal of this web site is to raise student’s calculus grad by 10%.  
Calculus Applets: A collection of Java applets illustrating calculus concepts. Requires Java Virtual Machine.  
Calculus on the Web: a system for learning, practicing and experimenting with the ideas and techniques of calculus  is ongoing work of Gerardo Mendoza and Dan Reich of the Mathematics Department at Temple University.  
Calculus Page: This site is calculus done the oldfashioned way — one problem at a time, one easytofollow step at a time, with problems ranging in difficulty from easy to challenging.  
CuttheKnot: A web site devoted to the deductive science of Mathematics. Learning to appreciate Mathematics, as well as tutorials, is a feature of this site.  
Dave’s Short Trig Course: A Basic Trigonometry web site. The site consists of notes that are an introduction and guide, not a full course. No tests, no transcripts, and no awards. There are a few exercises, but only a few.  
Dictionary of Algorithms and Data Structures: The National Institute of Standards and Technology offers this "dictionary of algorithms, algorithmic techniques, data structures, archetypal problems, and related definitions. Algorithms include common functions, such as Ackermann's function. Problems include traveling salesman and Byzantine generals. Some entries have links to implementations and more information." 

FractED: is an introductory fractal tutorial intended for high school or college entrylevel students. It is an informal discussion of some of the elements of fractal geometry, and includes interactive programs which demonstrate the techniques of fractal generation.  
GCalc: is free. It costs you nothing to use it. It is also licensed under the General Public License (GPL), making it free software. You can copy it, distribute it, and even compile it yourself. GCalc is a graphing calculator. Using web technology, GCalc is designed to provide a basic, wellbalanced set of graphing functionality to students and educators alike, all over the world.  
Math Abundance: This site provides upper secondary math tutorials for all math topics.  
Math Archives: — provides organized internet access to a wide variety of mathematical resources.  
Math and Physics Applets: Applets to help visualize various concepts in math and physics such as differential equations, fourier series, waveguide modes, electrostatic fields, etc., courtesy of software developer Paul Falstad.  
Math and Physics Help Home Page: — explains various concepts in Math and Physics.  
MathNerds: MathNerds has a strong commitment to inquirybased education. MathNerds provides free, discoverybased, mathematical guidance via an international, volunteer network of mathematicians. MathNerds does not supply answers to homework, take home test, and the like; rather they provide hints, suggestions, and references to help clients understand and solve their mathematical problems.  
Mathworld: A comprehensive and interactive mathematics encyclopedia.  
Purplemath: An easy to search site that concentrates on Algebra but branches out to other disciplines in Math as well.  
Webmath: This site has over 100 instantanswer, selfhelp, math solvers, ready to help you get your math problem solved.  
Geometry 
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Computational Geometry Algorithms Library: The goal is to make the most important of the solutions and methods developed in computational geometry available to users in industry and academia. The goal is to provide easy access to useful, reliable geometric algorithms.  
CuttheKnot: A web site devoted to the deductive science of Mathematics. Learning to appreciate Mathematics, as well as tutorials, is a feature of this site.  
Dave’s Short Trig Course: A Basic Trigonometry web site. The site consists of notes that are an introduction and guide, not a full course. No tests, no transcripts, and no awards. There are a few exercises, but only a few.  
FractED: is an introductory fractal tutorial intended for high school or college entrylevel students. It is an informal discussion of some of the elements of fractal geometry, and includes interactive programs which demonstrate the techniques of fractal generation.  
GCalc: is free. It costs you nothing to use it. It is also licensed under the General Public License (GPL), making it free software. You can copy it, distribute it, and even compile it yourself. GCalc is a graphing calculator. Using web technology, GCalc is designed to provide a basic, wellbalanced set of graphing functionality to students and educators alike, all over the world.  
Geometry in Action: Ideas from discrete and computational geometry (meaning mainly lowdimensional Euclidean geometry) meet some real world applications on this site. It contains brief descriptions of those applications and the geometric questions arising from them, as well as pointers to web pages on the applications themselves and on their geometric connections. It is organized by application but some major general techniques are also listed as topics.  
Geometry Junkyard: The pages contain Usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry. Some of it is quite serious, but much of it is also entertaining.  
The MacTutor History of Mathematics: This site was developed initially as part of the Mathematical MacTutor system for learning and experimenting with mathematics. It has an excellent archive with biographies of more than 1300 mathematicians, a collection of more than 60 articles on topics extensively studied by mathematicians, and an extensive index to mathematics history topics.  
Manipula Math with Java: This is a collection of 279 Math Applets. Interactive programs and animation illustrate the meaning of mathematical ideas.  
Math Abundance: This site provides upper secondary math tutorials for all math topics.  
Math Archives: — provides organized internet access to a wide variety of mathematical resources.  
MathNerds: MathNerds has a strong commitment to inquirybased education. MathNerds provides free, discoverybased, mathematical guidance via an international, volunteer network of mathematicians. MathNerds does not supply answers to homework, take home test, and the like; rather they provide hints, suggestions, and references to help clients understand and solve their mathematical problems.  
Mathworld: A comprehensive and interactive mathematics encyclopedia.  
Purplemath: An easy to search site that concentrates on Algebra but branches out to other disciplines in Math as well.  
Trigonometry 
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CuttheKnot: A web site devoted to the deductive science of Mathematics. Learning to appreciate Mathematics, as well as tutorials, is a feature of this site.  
Dave’s Short Trig Course: A Basic Trigonometry web site. The site consists of notes that are an introduction and guide, not a full course. No tests, no transcripts, and no awards. There are a few exercises, but only a few.  
Dictionary of Algorithms and Data Structures: The National Institute of Standards and Technology offers this "dictionary of algorithms, algorithmic techniques, data structures, archetypal problems, and related definitions. Algorithms include common functions, such as Ackermann's function. Problems include traveling salesman and Byzantine generals. Some entries have links to implementations and more information." 

GCalc: is free. It costs you nothing to use it. It is also licensed under the General Public License (GPL), making it free software. You can copy it, distribute it, and even compile it yourself. GCalc is a graphing calculator. Using web technology, GCalc is designed to provide a basic, wellbalanced set of graphing functionality to students and educators alike, all over the world.  
Math Abundance: This site provides upper secondary math tutorials for all math topics.  
Math Archives: — provides organized internet access to a wide variety of mathematical resources.  
Math and Physics Applets: Applets to help visualize various concepts in math and physics such as differential equations, fourier series, waveguide modes, electrostatic fields, etc., courtesy of software developer Paul Falstad.  
Math and Physics Help Home Page: — explains various concepts in Math and Physics.  
Math Forum: This site helps students learn mathematics through the use of the Internet and innovative technologies. It also gives advanced students an opportunity to pursue their interests as well as use their skills to help others.  
MathNerds: MathNerds has a strong commitment to inquirybased education. MathNerds provides free, discoverybased, mathematical guidance via an international, volunteer network of mathematicians. MathNerds does not supply answers to homework, take home test, and the like; rather they provide hints, suggestions, and references to help clients understand and solve their mathematical problems.  
Mathworld: A comprehensive and interactive mathematics encyclopedia.  
Purplemath: An easy to search site that concentrates on Algebra but branches out to other disciplines in Math as well.  
Triangles,Circle, and Waves: A trigonometry review site.  
Webmath: This site has over 100 instantanswer, selfhelp, math solvers, ready to help you get your math problem solved.  
Games & Fun 
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Against All Odds: A video program for high school and college students emphasizing “doing statistics”. The series goes on location to help uncover statistical solutions to everyday problems. Requires logging in.  
CuttheKnot: A web site devoted to the deductive science of Mathematics. Learning to appreciate Mathematics, as well as tutorials, is a feature of this site.  
Geometry Junkyard: The pages contain Usenet clippings, web pointers, lecture notes, research excerpts, papers, abstracts, programs, problems, and other stuff related to discrete and computational geometry. Some of it is quite serious, but much of it is also entertaining.  
IBM’s Ponder This: This portion of the official IBM web site is for the person who can’t see a problem without wanting to take a crack at solving it. If you are that kind of person, then IBM is looking for you. The people at IBM cordially invite you to match wits with them. Each month they post a mathematical problem. Then, in the next month, they offer the solution. Forge ahead and ponder this month’s problem.  
The MacTutor History of Mathematics: This site was developed initially as part of the Mathematical MacTutor system for learning and experimenting with mathematics. It has an excellent archive with biographies of more than 1300 mathematicians, a collection of more than 60 articles on topics extensively studied by mathematicians, and an extensive index to mathematics history topics. 
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