This site has lots of videos and ideas for hands-on science activities. Many can be done with household objects, but there are also links to kits and materials available through Amazon.
Free art lessons for elementary ages.
Online reading, math, and spelling curriculum for elementary ages.
Complete math curriculum for jr. high and high school levels.
This subscription site has loads of resources for learning through children's literature.
A website with lesson plans, worksheets, labs, and activities on biology topics.
The website of this museum in Boston has lots of informative articles, videos, and some free less