Soap In Mouth
A Bad Word Filter for Browser and NodeJs. It comes with its own blacklist, but you can add, remove, or modify it to fit your uses.
mQuery
mQuery is a small and compact jQuery alternative coming in at 2.8kB.
Router
A basic client side router that comes in a small package [1.1kb]. No Shadow Dom, No Virtual Dom... Just a simple callback function that gives you access to URL and GET parameters.
Tarp
A small (751b) JS canvas wrapper for interval, that makes animations easy.