Of course you're all familiar with the youtube channels of numberphile, mathloger, 3blue1brown, vsauce, and vihart, to mention a few excellent independent publishers. Maybe you'd also like to check out these sites, which I link here in a thinly veiled attempt to save them so I can find them again later.
https://keithpatarroyo.wordpress.com/
https://www.math.columbia.edu/~woit/wordpress/
http://www.math.ucr.edu/home/baez/ & https://johncarlosbaez.wordpress.com/
Enjoy!
http://www-elsa.physik.uni-bonn.de/~dieckman/InfProd/InfProd.html