Wikibooks!

Khan Academy is not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.

We are committed to making the best education in the world freely available to any person who seeks it. We envision people throughout the world, in both developed and developing countries, using our platform to get access to world-leading education that has so far been available only to a tiny few. We see them using this education to improve their lives, the lives of their families, and the communities they live in.

Online university-level technical courses. We believe university-level education can be both high quality and low cost. Using the economics of the Internet, we've connected some of the greatest teachers to hundreds of thousands of students all over the world.

Nuclino is the easiest way to organize and share knowledge in teams. Create real-time collaborative documents and connect them instantly like a wiki. Use the tree, board, and graph view to explore and organize your knowledge visually. It's great for meeting notes, product requirements, docs, decisions, and more.

Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education from pre-school to university, including professional training and informal learning. We invite teachers, students, and researchers to join us in creating open educational resources and collaborative learning communities.

The iTunes U app gives you access to complete courses from leading universities and other schools — plus the world’s largest digital catalog of free education content — right on your iPad, iPhone, or iPod touch. Whether you’re majoring in molecular biology at a university, taking Spanish in high school, or just interested in European history, you now have a valuable tool to help you learn anytime, anywhere.

The OpenCourseWare Consortium is a collaboration of higher education institutions and associated organizations from around the world creating a broad and deep body of open educational content using a shared model.

Catch up with intricate Science and Math concepts with Eureka.in NSES app.

The edx-platform is the main repository of edX Code covering both the LMS and the authoring tool, Studio. It also includes XModules and various graders.

University of the People is the world’s first tuition-free, non-profit, online academic institution dedicated to opening access to higher education globally for all qualified individuals, despite financial, geographic or societal constraints.

Open Yale Courses (OYC) provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University.

Take free Harvard online courses through Harvard Extension School's Open Learning Initiative. Course videos feature Harvard faculty.

Grok Learning is a browser-based learning platform.

Hexib helps people to learn easier by connecting them to experts and makers of educational content. In Hexib you can easily take notes around Video tutorials, chat with Experts and discuss around content.