Science games, experiments, and activities

Both online and offline: http://www.lawrencehallofscience.org/kidsite/

Engineering projects for kids

http://constructionmanagementdegree.org/blog/2010/100-awesome-engineering-projects-for-kids/

Free fun worksheets

These are fun worksheets, designed for homeschoolers instead of public school teachers.  They include things like lift-the-flap worksheets, puzzles and mazes, a brain hat, and more.

http://www.ellenjmchenry.com/homeschool-freedownloads/index.php

Not everything on this site is free, but everything on this page is.

Brain resources

Learn about the parts of the brain with an interactive map:
http://www.onlinecollegecourses.com/basic-brain-map

Then make a Brain Hemisphere  hat:
http://www.ellenjmchenry.com/homeschool-freedownloads/lifesciences-games/brainhemishpere.php

Science News for Kids

http://www.sciencenewsforkids.org/

Read the full articles online; organized by topic. You can get the titles and links in an email format.

Science experiments and activities

http://www.readingconfetti.com/2013/04/50-science-activities-for-kids-kids-co.html

Fun Math Videos (like calculating pi with pies)

https://www.youtube.com/user/numberphile/videos

Worksheet and test generator

http://www.problem-attic.com/

Drawing from previously-given tests (NY Regents, International NAEP, and state standardized tests), you can choose from thousands of questions to create worksheets or tests in English, Math, Social Studies, and Science.

Home made paint recipes

http://www.kidnkaboodle.net/paint.html

Math games and worksheets: Johnnie's math page

http://jmathpage.com/

Games and worksheets.

Arts worksheets

http://www.education.com/worksheets/the-arts/

Foreign Language worksheets

Spanish, French, Japanese, and German available:

http://www.education.com/worksheets/foreign-language/

Social studies worksheets, preschool through high school

http://www.education.com/worksheets/social-studies/

You get 10 free downloads per month, and the account is free.

Science worksheets, preschool through high school

http://www.education.com/worksheets/science/

Writing worksheets, preschool through high school

http://www.education.com/worksheets/writing/

Includes: grammar, punctuation, spelling, composition, poetry, and handwriting.

Reading Worksheets, preschool through high school

http://www.education.com/worksheets/reading/

Searchable, printable, free math worksheets

http://www.education.com/worksheets/math/

Spelling Bee Spelling Interactive

This is kind of fun, but is not a full spelling curriculum. It is good practice, though.

http://www.learner.org/interactives/spelling/index.html

Fun visual composition site

This is an amazing, addicting music composition site.
http://seaquence.org/

For an example composition, I threw this together in a few minutes:
http://seaquence.org/2d1t

Click on "share" to save your composition.

Learn yiddish (for kids)

http://www.yiddishpop.com/

Thousands of free lesson plans, worksheets, etc.: Share my lesson

http://www.sharemylesson.com/teaching-resources/