General Interest
Geogebra (free dynamic geometry software)
Mathematics resources at Project Gutenburg
Museum of Mathematics
Nick Hobson’s Mathematical Miscellany
\pi is “wrong!” (Bob Palais)
+Plus Magazine
Vi Hart, recreational mathemusician (also see a lovely article about her here)
Professional Associations/Institutes
AMS (American Mathematical Society)
CMS (Canadian Mathematical Society)
Fields Institute
MAA (Mathematical Association of America)
Mathematics Education
OAME (Ontario Association for Mathematics Education)
The Math Forum @ Drexel
Mathematics Contest Problems
Art of Problem Solving
Brock University Caribou Mathematics Competition (Grades 3–8)
CEMC (University of Waterloo)
Contest problem links at Wild About Math!
MIT Math Problem Solving Seminar (intended for first-year students preparing for contests)
Nick Hobson’s Mathematical Puzzles
History of Mathematics
MacTutor
Elementary/High School
Analyze Math (tutorials, problems, worksheets, applets, etc.)
Art of Problem Solving
BBC Maths (British)
Brock University Caribou Mathematics Competition (Grades 3–8)
Canada-Wide Performance Festival (Grades 4–6)
CLIPS (multi-media support for Grades 7–12)
Exercises in Math Readiness (EMR) (preparation for university), U. of Saskatchewan
Exploriments (simulations that allow students to explore concepts)
Geogebra (free dynamic geometry software)
James Tanton (videos, essays, links, lessons, etc.)
JUMP (John Mighton) (Grades 1–8)
Khan Academy
mathcentre (UK site for senior high school and early university … many resources here)
Math Warehouse (games, interactive examples, links, etc.)
Maths Net (British)
MIT High School Courses
nrich (UK)
Purplemath (algebra help, study skills, homework guidelines, links)
Regents Exam Prep Center (New York State)
Spirit of Math
STEM Directories (UK)
Vaguten (A quantum of knowledge for gifted and talented students)
Vector (Journal of the British Columbia Association of Mathematics Teachers)
Walter Fendt (applets and more)
College/University and Beyond
John Baez, UC Riverside
Khan Academy
Tanya Khovanova
Math at Stack Exchange
Math Overflow
Lecture Notes, Online Textbooks, Online Courses, etc.
John Armstrong
Pete L. Clark, University of Georgia
Miroslav Lovric, McMaster University
Willard Miller, University of Minnesota
MIT OpenCourseware
Roy Smith, University of Georgia
Peter Taylor, Queen’s University at Kingston
Jan Vrbik, Brock University
https://www.facebook.com/groups/drmath/doc/592615034116969/