Hello, habrasoobschestvo. I know you love freebies. And you love to learn. It is so? And what could be better for habravchanin free education? So I decided to compile a selection of links for you, where you can get your mind in IT.
All of the following resources are absolutely and officially free and free, which is good news.

UPD. Re-ranked sites. The “Computer Science” category includes those sites that can be added to more than one of the categories listed below. The ranking was made on most of the content, that is, in some sites classified in a particular category, articles not related to a specific may come across, but they will be an absolute minority.

Many thanks to the help of adding resources vansickle , RedFox , kagen , theinterman , sM1Le .
')

English speaking resources

Computer science

OpenCourseWare MIT

One of the largest repositories of training courses. Here are collected almost all the courses that are taught in Massachusets Institute of Technology, which is considered one of the best in the world. The site has a total of 1900 courses, and I have counted more than 200 courses taught at the Faculty of Electrical Engineering and Computer Science . The composition of most of the courses: brief lecture notes, a detailed description of the course, a calendar plan, laboratory tasks, course project tasks and exams, intermediate modules. Video lectures are attached to some courses.

Videolectures.net

Very good resource with a huge number of video lectures on computer disciplines in English. All lectures are categorized.

UC Barkeley Webcasts

Webcast site (both in audio and in video format) of the University of California, Berkeley. Except as a computer theme, there are quite a few other general educational disciplines. Sami webcasts conducted since 2001.

ShowMeDo

The site is dedicated to learning free software, in English. All lessons are presented in the form of video tutorials and screencasts. A lot of lessons on programming in Python.

YouTube EDU

The well-known YouTube channel dedicated to education. Here are collected together all the video lectures of world famous universities - MIT, Stanford, Cambridge and many others. There are also channels of 2 Russian universities - SZTU and MGIMO.

Academic Earth

Free video courses from leading universities - Harvard, Stanford, Berkeley, Yale and others. In computer science, 14 training courses are presented.

Design and web programming

Envato

A company for which thousands of designers from around the world are grateful. It was she who created the most popular Tuts + resources, which included sites with lessons on Photoshop , vector graphics , computer graphics , photography , ActionScript , web programming and layout , After Effects , computer sound processing . In addition to these resources, she owns her own online stores , a freelance exchange , a publishing house , a collection of creative work , blogs about life hacking , doing business on the Internet, and applications for poppy , web and iphone .

Tutorialized

Collection of various tutorials for various programs, ranging from office programs and ending with Adobe Flash and Adobe Photoshop (for the latest program more than 12 thousand tutorials).

Dev.Opera

Articles on web layout and programming widgets for opera

Microsoft ASP.net

Official ASP.NET website in English. Contains training videos, tutorials, podcasts, documentation on programming in this language.

Programming

Dev Articles

A very large database of articles devoted to programming.

System administration

HowtoForge

The site contains a large number of accurate step-by-step instructions for deploying and configuring various software based on linux and freeBSD, starting with apache and ending with SAMBA PDC.

Russian-speaking resources

Computer science

Intuit

The largest Russian-language resource. More than 320 courses, there is an opportunity to sign up for the course, knowledge tests and more. There are video courses.

Univertv.ru

An open educational video portal on which lectures of leading Russian universities are laid out. For IT people there are videos by categories Computer graphics, Programming, Design, Usability.

Techdays

Just a great video resource dedicated to Microsoft technologies, all together and each separately. Here you can see all the features of the future VS2010, learn the basics of WPF (which I myself did in principle) and ASP .NET, find out the details of deploying Windows 7. For those who work or are going to work with Microsoft products, the resource is recommended.

Microsoft Learning Library

This site is addressed to teachers, graduate students, students and enthusiasts who teach and study modern information technologies. Here are posted training courses developed at universities and training centers that use Microsoft technology in their educational process.

developerWorks

IBM resources for developers and IT specialists. There are many articles on UNIX, Lotus, Rational, WebSphere, Open source, SOA, XML.

Skillopedia.Ru

Skillopedia.Ru - video encyclopedia of knowledge that helps people learn new things.
With the help of Skillopedia, you can find lessons, go through distance learning and receive instructions on almost all life areas. View various video courses and trainings, study telling and showing interactive tutorials and instructions. This resource has a lot of IT-related lessons.

Programming

MSDN

Free library of articles on Microsoft software development tools. Many of my friends recommended it as the best resource for learning programming and just as reference material.

GotDotNet.Ru

Corporate blog dedicated to programming languages. NET.

Training Course Materials from Sun Microsystems

Materials of training courses in Russian, devoted to Java, Solaris, UML, programming technologies.

Computer Science Student

The site of the well-known habrovchanin Freetonik, which tells about his studies at a Canadian university. Also laid out materials, assignments for courses that he studies. The resource is very interesting and recommended for viewing.

System administration

Ubuntu Wiki in Russian

Ubuntu support information resource. It will be useful for beginners linuksoidov.

These are all the resources that I use for my own self-education. I would like to know which sites you use. I would be glad if you specify them in the comments. The most interesting will add to the review.