Internet Archive is an online library that offers permanent access for researches,scholars, people with disabilities, and the general public to historical collections that exist in digital format.
Project Gutenburg offers over 40.000 free ebooks. You can choose among free epub books, free kindle books, and you can also download or read them online. Check out The 9 Websites that offers free ebooks for more resources.
This is a platform provided by the United States government that offers excellent educational resources pertaining to a wide range of subjects
The British Museum allows users to learn and discover more than 500 Museum objects and have access to some awesome adventure games and many more.
School Forge offers open text and lessons, open curricula, free software and open source in education. It also features many educational resources and links for you to explore.
Dyscover is a software system designed to help children with learning disabilities. It can be used to teach characters, numerals, pronunciation, word-association and many more useful and creative things.
KidsKnowIt provides the highest quality educational activities, products, movies, music, games, articles, text books, learning programs, lesson plans, worksheets, and distribute them completely free of charge.
This is a great website that offers games that can help students acquire foreign language skills.