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Khan Academy is a non-profit educational organization created in 2008 by Salman Khan with the goal of creating a set of online tools that help educate students.The organization produces short lessons in the form of videos.Its website also includes supplementary practice exercises and materials for educators. All resources are available for free to users of the website. The website and its content are provided mainly in English.

The CK-12 Foundation is a California-based non-profit organization which aims to increase access to low-cost K-12 education in the United States and abroad.CK-12 provides free and customizable K-12 open educational resources aligned to state curriculum standards. As at 2014, the foundation's tools were used by 38,000 schools in the US, and others overseas. CK-12 was set up to support K-12 Science, Technology, Engineering, and Math (STEM) education.

Boundless creates free and low-cost textbooks and distributes them online. The company's textbooks consist of educational material taken from free and open sources. The company edits the material and arranges it to create a text in the form of an e-book. In some cases the company also provides study tools, such as flashcards and quizzes

OpenStax (formerly OpenStax College) is a nonprofit ed-tech initiative based at Rice University. Since 2012, OpenStax has created peer-reviewed, openly licensed textbooks, which are available in free digital formats and for a low cost in print. Most books are also available in Kindle versions on Amazon.com and in the iBooks Store

Blockly Games is a series of educational games that teach programming. It is designed for people who have not had prior experience with computer programming. By the end of these games, players are ready to use conventional text-based languages. Blockly Games is a Google project to encourage tomorrow's programmers. The games are designed to be self-paced and self-teaching.

PhET Interactive Simulations, a project at the University of Colorado Boulder, is a non-profit open educational resource project that creates and hosts explorable explanations. Their stated mission is "To advance science and math literacy and education worldwide through free interactive simulations." The project now designs, develops, and releases over 125 free interactive simulations for educational use in the fields of physics, chemistry, biology, earth science, and mathematics

Project Gutenberg (PG) is a volunteer effort to digitize and archive cultural works, to "encourage the creation and distribution of eBooks". It was founded in 1971 by American writer Michael S. Hart and is the oldest digital library. Most of the items in its collection are the full texts of public domain books. The project tries to make these as free as possible, in long-lasting, open formats that can be used on almost any computer. As of 23 June 2018, Project Gutenberg reached 57,000 items in its collection of free eBooks.

Book Dash gathers volunteer creative professionals to create new, high-quality African storybooks that anyone can freely translate and distribute.

The African Storybook (ASb) is a literacy initiative that provides openly licensed picture storybooks for early reading in the languages of Africa. Developed and hosted by Saide, the ASb has an interactive website that enables users to read, create, download, translate, and adapt stories. The initiative addresses the dire shortage of children’s storybooks in African languages, crucial for children’s literacy development. As of September 2017 there are more than 800 unique stories in 111 languages spoken in Africa, including English, French, and Portuguese, for a total of over 4600 stories

Algebra2go has tools to help you refresh your math skills. It has video lectures, video worksheets, homework sets, quizzes and study guides. The courses covered include pre-algebra, algebra, Intermediate algebra and calculus. The resources are free thanks to the support of Saddleback College, the California Basic Skills Initiative, and the Saddleback College Foundation.