In addition to the 5 repos listed at github.com/zaz, these repositories may be of some use:

equation_audio

Allows you to enter a formula for a wave and hear the wave played as audio. https://zaz.github.io/equation_audio/

cghack

Make the GitHub contributions graph show any pattern you want.

form2email

A 120-line Express server to turn POSTed form data into an email. Great for static websites with contact forms!

bloom-filter

A fast, 70-line bloom filter for JavaScript 6.

dijkstra

A 60-line library with an efficient algorithm to find shortest paths between nodes in a graph.