Tom Duff, known for Duff's device, publishes short C programs, math notes on trigonometry and essays on code style.
Commenters praise his C style and cite his short programs, trig notes and essay on reading code from top to bottom.
Less focused but enjoyed Eddie Woo's and 3blue1brown's more recent videos on Youtube
Also challenged by Tom Duff's trigonometry page - http://www.iq0.com/notes/trig.html
Enjoy learning how to derive identities and equations from first principles - quite like differential of x^2 => 2x and the quadratic eqn via completing the square
I found a few other interesting little notes on his site:
http://iq0.com/notes/trig.html All you need to know about Trignometry
http://iq0.com/notes/frobenius.html The Frobenius-Burnside Counting Formula
http://iq0.com/notes/geometric.html Sum of a Geometric Series
I really like td's style of writing C. You can find some of his code here: http://www.iq0.com/duffgram/index.html
Reminds me of Tom Duff's Essay 'Reading code from top to bottom': http://www.iq0.com/notes/deep.nesting.html
I like Tom Duff's http://www.iq0.com/duffgram/com.html for experimental programs contained in a single file.
I really like Tom Duff's http://www.iq0.com/duffgram/com.html to compile and run in two commands.