Some potentially useful programs / scripts that I've written:
An online tool that counts lines and characters for UCAS personal statements
A server-side script which parses Nyaa.si torrent pages to create an RSS feed of its comments. Source code available (GitHub mirror).
A chess clock that runs on your web browser. Convenient and intuitive UI on both desktop and mobile devices (tested on Kindle Touch). Source code available (GitHub mirror).
An application indicator for Unity that simulates keyboard lock keys LEDs (Caps Lock, Num Lock and Scroll Lock)
Allows Pygments to recognize GTK+ types for highlighting
A userscript which allows you to navigate xkcd comics using your keyboard only
Static filter for uBlock Origin which blocks content farms and other fake news sites with contents mainly in the zh locale
A randomly fluctuating divergence meter / clock based on Steins;Gate.
A parody of the "Fidget Spinner apps" that were a thing back in 2017. See this blog post for context.
Very simple browser game.