HTML
Several interactive HTML and flexbox examples and a font preview.
JavaScript
Various JavaScript games, references, examples, and demos.
React
Various React references and demos.
PERN
Several demos utilizing Postgres, Express, React, and Node.
SVG
Several examples, references, and doodles.
Perl
I used to program exclusively in Perl. Not so much anymore.
Crypto
A bunch of cryptograpic demos, examples, and tutorials.
NLP
Some Natural Language Processing examples. Not much, currently.