A python program for generating images with text that can only be read when you hold them nearly edge on to your eye—like from cereal boxes!
A widget for Jewish halakhic times that pulls the user's location and outputs zemannim according to Sephardic tradition. It uses the SunCalc library to calculate the position and phase of the sun and moon.
An HTTPS reverse proxy that lets people pick custom subdomains for their websites and web apps.
Cellular automata are always fun to play with. While elementary cellular automata alone are awesome, adding an additional order to them makes them even *cooler*!
A Pico-8 game with beautiful animation.
A small Lisp written in C. Jeff kept a diary on his blog (https://blog.jfo.click/) while writing it.
A little interactive explorer for the CIE HLC colorspace, which has been suggested (by the freiefarbe.de people among others) as colorimetrically sound colorspace that's also well suited for communication.
A very simple version of the wave function collapse algorithm, which creates patterns that are locally similar to an input bitmap.
Exploring the Prolog programming language as a means to throwing the ideal dinner party.