The Math Open ReferenceThis free interactive math textbook prototype covers high school geometry and plans to expand to other areas of math. The interactive books promise to include text, interactive quizzes, digital manipulatives and more.
Math/Statistics-Only titles listed on the landing page are open access. Look for a green circle with a check mark for open access articles.
R: The Project for Statistical Computing"R is a language and environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment... R can be considered as a different implementation of S. There are some important differences, but much code written for S runs unaltered under R... R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, …) and graphical techniques, and is highly extensible."
SageMath"SageMath is a free open-source mathematics software system licensed under the GPL. It builds on top of many existing open-source packages: NumPy, SciPy, matplotlib, Sympy, Maxima, GAP, FLINT, R and many more. Access their combined power through a common, Python-based language or directly via interfaces or wrappers... Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab."
A source for all things math, WolframAlpha is a computational source to help you muddle through tough math problems with step-by-step solutions available.
This website takes you to resources available for Kindergarten through to Precalculus classes. It includes activities, slideshows, and worksheet problem sets for most every math class.
The math worksheets , the printable multiplication tables, the math charts, the multiplication games, and other resources are completely free. It’s an OER site.
A free repository of videos for high school math & science classes created by gifted volunteer teachers from around the world, seeded initially by MIT faculty members and by partnering educators in Jordan and Pakistan.