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4Teachers - Suite of online tools and resources to help you integrate technology into the classroom, including lessons, quizzes, rubrics and calendars.
Curriki - An online environment dedicated to the development and free distribution of world-class educational materials, currently providing over 40,000 learning resources for K-12.
HippoCampus - High-quality, multimedia content and course materials in Algebra, Calculus, Government, Biology, Environmental Science, Physics, Psychology, Statistics and US History.
Mastery Connect - A site to share and discover common formative assessments. The free plan includes an online learning community. Paid plans include mastery tracking, assessment tools, progress reports and more!
Read Write Think - Offers free lesson plans and interactives in reading and language arts instruction.
TeAchnology - Resources for teachers dedicated to improving the education of today's generation of students, featuring lesson plans, printable worksheets, rubrics, teaching tips, worksheet makers, web quests, math worksheets, and thousands of other great teacher resources. Some are free; premium memberships available.
Teachers.Net - Free teacher resources including chatboards, lesson plans, and more.
Teachers' Domain - A free digital medial service for educational use from public broadcasting and its partners with thousands of media resources, support materials and tools for classroom lessons, individualized learning programs, and teacher professional learning communities.
ThinkFinity - Thousands of free lesson plans and educational resources for teachers to enhance learning.