Khan AcademyKhan Academy is a nonprofit organization that aims to provide free, world-class education to anyone, anywhere.

Discovery SchoolDiscoverySchool.com offers clipart and free teaching resources. You can also find personalized classroom materials.

American Library AssociationThe ALA is the oldest and largest library association in the world. Includes association information, news, events, and advocacy resources.

Vocabulary UniversityVisit Vocabulary University and use these fun activities to learn about words, their meanings, and how they came to be a part of the English language.

ScholasticOffers content and products for children, interactive pages where kids can play with their favorite book characters, read about new books, and more.

Accelerated Reader BookFinderSearching for Accelerated Reader books is fun and easy with this free online tool.

Digital Dutch (unit converter)Converts area, density, energy, force, length, mass, power, pressure, speed, temperature and volume, bits and bytes.

New York TimesOnline edition of the newspaper's recent content with searchable archives for a fee. [Registration required]