LearnIt/Mathematics

Calculus

 * Advanced Calculus [link]

Linear Algebra

 * Linear algebra - Gilbert Strang, MIT [link]

Differential Equations

 * Differential eqiations, MIT [link]
 * https://www.edx.org/course/introduction-differential-equations-bux-math226-1x
 * https://www.edx.org/course/linear-differential-equations-bux-math226-2x
 * https://www.edx.org/course/nonlinear-differential-equations-order-bux-math226-3x

Algebra

 * Lie Groups and Lie Algebras - PI & PSI, ... [link] (with a particular focus on physics, though)

Differential Geometery

 * Tensor Calculus and the Calculus of Moving Surfaces - P. Grinfield [link] (todo: much more stuff is on his channel)

Functional Analysis
https://youtube.com/playlist?list=PLUl4u3cNGP63micsJp_--fRAjZXPrQzW_&si=VPKXWHeCyQm3t2kN
 * none

Other

 * The Fourier Transforms and its Applications, Stanford, [link]
 * Math history [link]
 * Differential topology - J.W. Milnor [link]
 * Topology & Geometry by Dr Tadashi Tokieda [link]

Links
youtube channels with math lectures
 * [MathTheBeautiful] - youtube channel of Pavel Grinfeld with his many lectures
 * [James Cook]
 * [Professor Leonard]
 * [LeonardEuler1]
 * [Winston Ou]