This site provides a variety of ready to use lesson plans on a variety of topics. The lessons have an essential question as well as an outline of strategies and activities that can be used to teach them. In addition, if appropriate, graphic organizers will be provided for use with the lessons. When you get to the site use the Find a Lesson Plan search feature to easily see if there is a lesson that aligns to your curriculum.
Glean Learning Tools are free science, math and information literacy teaching tools produced by Public Learning Media, Inc., an education technology 501(c)3 nonprofit.
This is one of the oldest publically accessible U.S. repositories of education resources on the web. It contains a variety of educational resource types from activities and lesson plans to online projects to assessment items.
Great variety of games on this site to teach vocabulary. K-12 games. You just pick a game type on the main page and then you can pick a category on the left and you will see what is available by grade level.
this site, maintained by RobinL. Simmons, provides grammar explanations and numerous interactive exercises handouts for teachers and students in grades 6-12.
This site offers an introduction to mathematics and its variety of topics. It's not just for kids, it's for everyone (even if you aren't a number nut).
Conceptua Math has some free tools available for users. While there is a subscription with conceptua math, the free things look interesting and worth checking out.
SoftSchools.com provides free math worksheets, free math games, grammar quizzes and free phonics worksheets and games. Worksheets and games are organized by grades and topics. These printable math and phonics worksheets are auto generated.