Fun things:

• Endless "Freefall" comic reader
• "Papers Please" citations generator (and its Python version)
• A Firefox addon to tag Reddit users by their subreddit activity (like Masstagger or Reddit Pro Tools)
• Semi-functional attempt to port a Flash game (original here)
• A MUD client that works as a relay with IRC connectivity (INSECURE! USE AT YOUR OWN RISK)

Some UserCSS (needs Stylus browser extension to be useful):

• SpaceBattles/SufficientVelocity invisible text revealer
• Remove the annoying border in Twitter's dark theme - updated for the new twitter!
• Display alt-text (label) or lack of it for images, and warn if it is missing when editing
• Reduce the visual clutter for Medium based sites
• A userstyle to make Wikia/Fandom sites look more like default MediaWiki theme
• A purple theme for dragon.style fediverse instance
• Make SB/SV reader mode actually cozy
• A few small utils for puzzling.stackexchange.com
• Make r/mildlyinfuriating more annoying with one neat trick! Click here to...