Leaflet.js is a library for making interactive maps. You might be surprised how many times you have to use maps on your site and leaflet can be a lifesaver.
Luxon.js is a library which is a modern replacement for moment.js which is a wrapper for JavaScript Dates and Times.
Three.js is possibly this coolest library on the list, it allows you to make 3-D animations that run in the browser
Still here? Here's are 2 bonus libraries
Chart.js is a library for making beautiful charts using JavaScript.
Chart.js is a library for making beautiful charts using JavaScript.