TraceKit : Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.
Styletron : Styletron is a universal CSS-in-JS engine built from the ground up for high-performance.
jsPDF : A library to generate PDFs in client-side JavaScript.
loglevel : Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Photon : UI toolkit for building desktop apps with Electron.
Rainbow is a code syntax highlighting library written in Javascript.
It was designed to be lightweight (1.4kb), easy to use, and extendable.
It is completely themable via CSS.