This website is generated with Jekyll, designed in Sketch and written by me. The font you are seeing is EB Garamond. The color scheme is derived from the syntax coloring scheme of Atom, my favorite general-purpose editor. I use Xcode and CocoaPods for iOS development. I use Mathematica for all mathematical stuff that you could possibly think of (psst. my university provides free licenses, yours might too).
And I don’t like GPL.