Communities and courses

Online courses

Free online courses from top colleges

http://academicearth.org

Free online courses from the world's best universities

https://www.edx.org/

IITs and IISc e-learning courses

http://nptel.ac.in/

Class Central - Courses from top universites

https://www.classcentral.com/

MIT OpenCourseWare

http://ocw.mit.edu/index.htm

Online courses offered by top universities

http://www.coursera.org

Associations and journals

ACM

http://www.acm.org/

Open repository of scientific papers

e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics (Cornell University library)

http://arxiv.org/

CS topics and practice

http://www.geeksforgeeks.org/

North American Network Operators's Group (NANOG)

https://www.nanog.org/

Many routing and switching protocol presentations are available here.

Mathematics

https://www.youtube.com/user/misterwootube/videos (Eddie Woo classes)

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