- Applied Math and Science Education Repository
AMSER is a portal of educational resources and services built specifically for use by those in Community and Technical Colleges but free for anyone to use.

- arXiv.org
From Cornell University's Library, open access to 675,014 e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.

- Common Equivalents Weights and Measures
- Conversion Calculator
Converts length/distance, area, volume, weight/mass, temperature, times, and cooking measures.

- Conversion of Units
- Create A Graph
- Fields Award
The equivalent of a Nobel Prize in the field of Mathematics, established to recognize both existing mathematical work and also the promise of future achievement. Only awarded to mathematicians under age 40.

- Khan Academy Videos

The equivalent of a Nobel Prize in the field of Mathematics, established to recognize both existing mathematical work and also the promise of future achievement. Only awarded to mathematicians under age 40.

- Mathematical Resources on the Web
- Mathematics Notation for Orders of Magnitude
- Online conversion of weights and measures, measurement conversion.
- Units of Measurement
Don't know how big a rod or a furlong is? Never heard of a zentner nor a quintal ? This dictionary offers conversion factors and definitions for units of measure from the metric, English and international (SIPM) systems of weights and measures as well as scientific units and some traditional units from other cultures. Interesting historical background is offered with many of the definitions.

- Universal Currency Converter
- Wolfram MathWorld: The Web's Most Extensive Mathematics Resource
- Wolfram|Alpha
Computational knowledge engine