supersearches:
sidesearches: math, lie theory
subsearches: nuclear physics, quantum mechanics
General learning (wikis)
Knowino
New World Encyclopedia
Physics learning resources
Feynman Lectures - Transcribed and cleaned up version of a series of lectures done by physicist Richard Feynman
Brilliant.org articles
Khan Academy - A good general education resource for a lot of introductory physics as well as other subjects like math and history; video/article based
Profound Physics - some good free physics articles here, but as a heads up, it does feel like it's really trying to sell to you sometimes
MathsIsFun (Physics)
Mindat - Mineral database
Pending
Good physics video about symmetry
The relationship between chaos, fractal and physics
FloatHeadPhysics: Quantum Mechanics Intuition Playlist
Earth.Nullschool - meteorology visualization of global weather conditions