Recently, we came across a list of links to free online courses from various US educational institutions. The list seemed to be interesting, he was harassed to someday see what these courses are all about. Here, at last, hands reached.
I looked through every link from this very list, looked through all the courses and gathered information that will be useful to you when you want to increase your level of knowledge in a particular area.
Interesting fact : It turns out there is a whole movement -
OpenCourseWare , which began in 1999 in Germany, when one of the universities posted videos of their lectures online. Soon and other universities picked up the initiative and now OpenCourseWare is quite a popular thing, which consists of courses and free educational materials created at universities and distributed via the Internet.
As a rule, OCW resources do not require registration and do not offer any passing certificates. All training is self-improvement.
Under the cut list of free online courses and lessons from the best educational institutions

Free online courses from the
Massachusetts Institute of Technology , one of the most prestigious institutions in the United States and the world.
Each course was created on the basis of a real MIT course, the lectures were filmed and posted on the site as educational material.
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Here is a list of the most visited courses as of August 2013:
Some courses were translated into several languages, including Ukrainian (for some reason, there is no Russian).
Materials are available on the site without registration.

Archive of video and audio content from
Stanford University (California, USA).
You just need to download iTunes and you will get access to all the content provided. All content can be viewed and downloaded for free.
English language.

One of the divisions of the private
University of Brigham Young , Utah.
Offers lessons on the following topics:
- Genealogy and family history
- Parenting
- Gardening
- US history and state
- Maths
- Music
- Personal financial planning
- Personal development
- Physical health
- Religion
- Spelling and spelling (English)
Cons: registration form is quite inconvenient.
The language of lectures is English.

The so-called grant-funded group (funded by grants) from a private university and
Carnegie Mellon Research Center (Pennsylvania, USA).
It offers a fairly extensive selection of courses:
A simple registration form that does not require account verification.
Very comfortable look.
Excellent practical exercises with instant check of the result.

Berkeley Webcast is a resource developed by
the University of California at Berkeley .
At the moment it includes more than 100 courses of various topics. Basically, these are video lectures that can be downloaded or viewed on the website.
English language.
Courses are available without registration or pre-registration.
Very user friendly interface.
Course from University of California, Irvine

OCW from one of the campuses of
the University of California , which is located in the city of Irvine, California.
Offers courses on the following topics:
Registration is not required.
English language.

The resource contains open and free educational materials from the elite Catholic
University of Notre Dame in Indiana.
Offers more than 24 topics:
Registration is not required.
English language.

A series of free courses provided by the
University of Washington .
List of courses:
Registration is not required.
English language.

Open source from
Yale University , Connecticut.
Offers courses in more than 20 disciplines. Lectures are available for both viewing and downloading. Also, there is an audio version of each lecture that you can download to your phone and listen on your way to work.
Registration is not required.
English language.

Free music lessons from
Berkley College of Music (USA), graduated from the legendary
Steve Wai .
On this resource you can find lessons on almost any musical theme, ranging from
Music Business and ending with
DJ & Turntable.Most Popular Lessons:
Registration is required. You specify your email and you receive a link to the lecture by e-mail.
Lecture language - English
I remembered about OpenCourseWare at the beginning of the article for a reason - many of these schools are members of the Open Course Ware Consortium. And, if you could not find the course to your taste in this article, then with a high degree of probability you will be able to find something to your liking in the course catalog:
http://www.ocwconsortium.org/en/courses/catalog .
Good luck in self-development and so on ...