Discovery Education - Offers free resources in many subjects
Pinterest - Create fun education boards
Library of Congress - Classroom materials from the library's digital collection are available
The National Science Digital Library - Online library for education in science, technology, engineering, and mathematics (STEM)
TeacherVision - Find lesson plans, printables, and more in this one stop shop (does cost money for a subscription)
teAchnology - Free and easy-to-use resources for teachers
Teachers Pay Teachers - Running out of ideas for your unit? Check out this site for a multitude of resources!
Thinkfinity - Free digital learning platform includes many resources for all subjects
WebQuest - An online inquiry-based lesson format
The Lancaster High School library has a Pinterest page! Check it out for valuable resources (still a work in progress.)