Free University

I’m sure there are many more, but theses are the ones that have been useful to me:

LibriVox
LibriVox is an online digital library of free public domain audiobooks, read by volunteers. In December 2010, it had a catalogue of over 4,500 unabridged books and shorter works available to download. Around ninety percent of the collection is in English, although LibriVox recordings are available in 33 languages altogether.
Khan Academy
The Khan Academy is a not-for-profit educational organization, created in 2006 by MIT graduate educator Salman Khan. With the stated mission of “providing a high quality education to anyone, anywhere”, the website supplies a free online collection of more than 2,400 micro lectures via video tutorials stored on YouTube teaching mathematics, history, finance, physics, chemistry, biology, astronomy, economics and computer science.
NPTEL (IIT Classes)
The National Programme on Technology Enhanced Learning (NPTEL) is a Government of India sponsored collaborative educational programme. By developing curriculum-based video and web courses the programme aims to enhance the quality of engineering education in India. It is being jointly carried out by 7 IITs and IISc Bangalore, and is funded by the Ministry of Human Resources Development of the Government of India. As of December 2009, over 250 courses were available online.
Annenberg Media
Annenberg Media is an entity of the Annenberg Foundation that creates educational resources (video, print, and Web based) to improve teaching methods and subject-matter expertise. Their K-12 and higher education resources are distributed to schools, non-commercial community agencies, colleges and universities. Annenberg Media delivers its materials free-of-charge through learner.org. Learner.org is a leading online educator resource that provides educational materials to teachers throughout the U.S. Created and operated by Annenberg Media, the website offers integrated multimedia K-12 materials to teachers for in-class use and professional development. Programs are also available for viewer’s use at home.
Wikimedia
Wikibooks
Wikibooks (previously called Wikimedia Free Textbook Project and Wikimedia-Textbooks) is a Wiki hosted by the Wikimedia Foundation for the creation of free content textbooks and annotated texts that anyone can edit.
Wikipedia
Wikipedia is a free, web-based, collaborative, multilingual encyclopedia project supported by the non-profit Wikimedia Foundation.
Wikiversity
Wikiversity is a Wikimedia Foundation project, which supports learning communities, their learning materials, and resulting activities. It differs from more structured projects such as Wikipedia in that it instead offers a series of tutorials, or courses, for the fostering of learning, rather than formal content.
Project Gutenberg
Project Gutenberg is a volunteer effort to digitize and archive cultural works, to “encourage the creation and distribution of eBooks”. Founded in 1971 by Michael S. Hart, it 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 June 2011, Project Gutenberg claimed over 36,000 items in its collection.
Open Learning Initiative at Carnegie Mellon
Using intelligent tutoring systems, virtual laboratories, simulations, and frequent opportunities for assessment and feedback, the Open Learning Initiative (OLI) builds courses that are intended to enact instruction – or, more precisely, to enact the kind of dynamic, flexible, and responsive instruction that fosters learning.
MIT Open Courseware
MIT OpenCourseWare (MIT OCW) is an initiative of the Massachusetts Institute of Technology (MIT) to put all of the educational materials from its undergraduate- and graduate-level courses online, partly free and openly available to anyone, anywhere, by the end of the year 2007. MIT OpenCourseWare can be considered as a large-scale, web-based publication of MIT course materials.
Open Security Training .info
In the spirit of OpenCourseWare and the Khan Academy, OpenSecurityTraining.info is dedicated to sharing training material for computer security classes, on any topic, that are at least one day long.
VideoLectures.NET
VideoLectures.NET is a free and open access educational video lectures repository. The lectures are given by distinguished scholars and scientists at the most important and prominent events like conferences, summer schools, workshops and science promotional events from many fields of Science. The portal is aimed at promoting science, exchanging ideas and fostering knowledge sharing by providing high quality didactic contents not only to the scientific community but also to the general public. All lectures, accompanying documents, information and links are systematically selected and classified through the editorial process taking into account also users’ comments.
University of California Television
University of California Television provides informational, educational, and enrichment television programming to the public and draws upon the vast intellectual, scientific, and creative talents of the University of California.
UCSF Osher Mini Medical School
The UCSF Osher Mini Medical School is designed to provide members of the community the opportunity to see and hear what goes on every day in UCSF’s classrooms and research labs with lectures from the same faculty who are on the front lines, teaching students in the health professions.
PEOI
Professional Education, Testing and Certification Organization International was created, and is run by volunteers who believe that it is time for open post secondary education be made available to all free of charge, and that the Internet is making this possible.
BBC Languages
French, German, Spanish, Italian, Greek, Portuguese, Chinese, and many others.

Alright, the ones below this line may not exactly be Harvard, but each are definitely an incredible wealth of knowledge.

TV Tropes
Internet Movie Database