This is one of the oldest publicly 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.
Thinkfinity is a free online professional learning community that provides access to over 50.000 educators and experts in curriculum enhancement, along with thousands of award-winning digital resources for k-12
This is a teacher-created site designed to help teachers find online resources more quickly and easily. It provides lesson plans, thematic units, teacher tips, discussion forums for teachers, downloadable teaching materials, printable worksheets and many more.