This site keeps track of End Of Life dates for various tools and technologies. It collates this data and presents it in an easily accessible format, with URLs that are easy to guess and remember. Code is here: https://github.com/endoflife-date/endoflife.date
Folders is a programming language that doesn't use any text; programs are encoded into a directory structure. All files within are ignored, as are the names of the folders. Commands and expressions are encoded by the pattern of folders within folders. Gave me a new perspective from which to think about form and content!
This site takes a MediaInfo JSON and generates charts that provide you with a high-level overview of your audio and/or video collections.
You can read more about it on Ashley's blog at https://bits.ashleyblewer.com/blog/2021/04/03/media-collection-viewer/
and check out the code at https://github.com/ablwr/media-collection-viewer.
This app uses Tonejs to play back MIDI files in the style of old video game music, or chiptunes. In the image, it's giving a rousing rendition of the Titanic theme song. Check out the code here: https://github.com/SophieShears/MidiToChiptune.