Classroom Zoom - A supply of lessons, hundreds of interactive whiteboard activities, and easy-to-use tools to customize your own math worksheets, language arts activities, crossword puzzles, social studies lessons, and more. Although there is a cost for full access, there are many free lessons and activities as well, searchable by grade level and subject area

Education Place - From Houghton Mifflin, includes "resources for elementary-school teachers, students, and parents. Includes Reading/Language Arts, Math, Science, and Social Studies Centers, Intervention, Professional Development, searchable activity database, educational games, and textbook support.

Education World  - Links to lesson plans, articles on topics in education, and more content area sites.

EDSITEment  - “The best of the humanities on the web from the National Endowment for the Humanities.” Lesson plans, learning activities, and peer-reviewed websites.

Gateway to Educational Materials - Lesson plans available through browsing subjects or keywords or performing specific search.

HotChalk's Lesson Plan Page - over 3,000 free lesson plans across the content areas, organized by subject area, grade range and lesson topics, with links to discussion forums, worksheets, experiments and other resources for teachers.

InfoMine - Large resource comprising lesson plan sites, online reference sources, directories of U.S. schools, plus additional educational links.

LessonPlanz - Searchable directory of lesson plans for all subjects grades K-12. Also allows browsing and offers worksheets and webquests.

MiddleWeb - Comprehensive resource for middle school teachers includes links to many articles related to teaching middle school as well as lesson plans.

PBS TeacherSource - Over 3000 lesson plans and activities. Searchable by subject and by standard.

Teachers FIrst - TeachersFirst is a rich collection of lessons, units, and web resources designed to save teachers time by delivering just what they need in a practical, user-friendly, and ad-free format. Busy teachers, parents, and students can find resources using our robust search tools.

Thinkfinity - built upon the Verizon Foundation’s education program formerly known as Verizon MarcoPolo. A comprehensive site for lesson plans and resources for K-12 academic subjects and literacy instruction, standards-based and research-based educational and literacy resources for teachers, instructors and students.

Awesome Library - Links to sites organized by area of interest. Some lesson plans.

DiscoveryEducation.com - Lesson plans K-12, puzzlemaker, clip art, and sites for students.

Educational Hotlinks for Middle School People - Produced by New Jersey Consortiuum for Middle Schools and Kean University, lists websites which have been chosen for their quality and special relevance for middle level educators. Includes content areas, guidance, lesson plans, media literacy, professional resources and more.

Mid-Continent Research for Education and Learning (McREL) - McREL nonprofit organization whose purpose is to improve education through applied research and development. K-12 standards, links by subject, and some activities.       

New York Times Learning Network - News summaries, news quiz, lesson plans grades 3-12, and web tours.

The Association for Curriculum and Development (ASCD) - Tables of contents plus some full-text articles from Educational Leadership, online job bank, and education news are some of this site’s features.

National Education Association (NEA) - Among the features of this site are education news, classroom tips, and information on Read Across America.

Phi Delta Kappa - This site offers tables of contents and some full-text articles from Kappan magazine and other information of interest to educators.