These links will take you directly to the portions of databases that contain materials relevant to Mathematics. However, this is by no means an exhaustive list. Feel free to explore the General Collections to find additional resources.
Open source textbooks that are written by professional content developers who are experts in their fields and undergo a rigorous peer review process. All textbooks meet standard scope and sequence requirements.
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Free interactive math and science simulations. PhET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery. These simulations are free for instructors to use, distribute, and modify - even in commercial ways. Attribution must be given to the original source, however.
Free eBooks and textbooks that can be downloaded as a pdf, no registration needed. These books cannot be altered, but can be freely printed, shared, or embedded in non-commercial ways. They are intended only for individuals, colleges, and schools. Site-Specific Licensing.
A portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use. AMSER is funded by the National Science Foundation (NSF) as part of the National Science Digital Library, and is being created by a team of project partners led by Internet Scout. Licenses vary. Verify individual items.
WeBWorK is supported by the MAA and the NSF and comes with a National Problem Library (NPL) of over 20,000 homework problems. Problems in the NPL target most lower division undergraduate math courses and some advanced courses. Supported courses include college algebra, discrete mathematics, probability and statistics, single and multivariable calculus, differential equations, linear algebra and complex analysis.