Statista is a statistics portal that provides current data on over 80,000 topics from more than 10,000 different sources including agriculture, advertising, health, hospitality, and consumer goods. Ready-made tables are available for download.
The Electronic Library of Mathematics
The Electronic Library of Mathematics provides mostly free and full-text access to journals, article collections, monographs, and electronic resources in the field of mathematics.
MathVids.com, from SchoolVids LLC, provides video tutorials for mathematical concepts ranging from middle school level basic math to college-level discrete math and differential equations.