@ndrew

Video

1. https://www.class-central.com/ (META-AGGREGATOR of the 37 course providers as of August 2014)
2. http://www.udacity.com/
3. https://www.coursera.org/landing/hub.php
4. https://www.edx.org/
5. http://ocw.mit.edu/courses/
6. http://www.khanacademy.org/
7. http://online.stanford.edu/courses
8. http://oyc.yale.edu/
9. http://www.ted.com/
10. http://www.thersa.org/
11. http://bigthink.com/
12. https://thenewcircle.com/s
13. http://www.saylor.org/
14. https://hexlet.org
15. http://shad.yandex.ru/lectures/
16. http://www.lektorium.tv/
17. http://techforum.mail.ru/video/
18. http://www.microsoftvirtualacademy.com/home.aspx
19. http://www.intuit.ru

Books, papers and patents

1. http://resrc.io/
2. http://it-ebooks.info/
3. http://www.foxebook.net/
4. http://www.wowebook.org/
5. http://c-books.info/
6. http://elbitz.net
7. http://www.ebookvortex.com/
8. http://citeseer.ist.psu.edu/index

Text & Article directories + Documentation:

1. http://www.ibm.com/developerworks/topics/
2. http://www.dzone.com/links/index.html
3. http://habrahabr.ru/
4. http://www.howtoforge.com/
5. http://net.tutsplus.com/
6. http://readthedocs.org/
7. http://seom.info/seo-book/
8. Encyclopaedia Britannica (UK) Ltd - Encyclopaedia Britannica 2012. Ultimate Reference Suite [2012, ENG]
9. http://html.adobe.com/

And counting! Feel free to post links in comments!

Paid:

1. https://www.codeschool.com/
2. http://teamtreehouse.com/library

UPD: Inpire yourself by reading SEVEN ASPECTS OF THE 21ST-CENTURY EDUCATION SYSTEM (aka 7 ЭЛЕМЕНТОВ СИСТЕМЫ ОБРАЗОВАНИЯ XXI ВЕКА) by PAVEL DUROV. UPD2: Durov actually stole the idea completely from RSA (see the video in the top section of the page).