This site is devoted to mathematics and its applications. Created and run by Peter Saveliev.

Math online

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Places to find math:

Type of site Examples Is it useful as a course? Is it useful as a reference? Is it fun?
Video lectures Khan Academy, MIT OpenCourseWare, YouTube
Yes
No
Some
Q&A/social MathOverflow, StackExchange
No
No
Some
Online books Applied Topology and Geometry, Hatcher's topology book
Yes
Yes
Some
Lecture notes Online lecture notes
No
No
No
Encyclopedias Wikipedia, PlanetMath, Wolfram MathWorld
No
Yes
No


Will there be time when everybody keeps his stuff at his own site and all of these "communities", aggregators, middlemen die out?