Currently enjoying the 2017 lectures (and I bought the text) for McElreath's bayesian stats course:

http://xcelab.net/rm/statistical-rethinking/

Strang's MIT OCW Linear Algebra is pretty good. Probably also needs the textbook.

John Tsitsiklis' MITx edx Probability intro course is probably the best course I've taken anywhere and better than anything I did in person at university. I didn't buy the text for this one though I probably should.

Robert Sapolsky's Human Behavioral Biology Stanford lectures are well worth watching. https://www.youtube.com/playlist?list=PL848F2368C90DDC3D