Prettier : Prettier is an opinionated code formatter. It enforces a consistent style by parsing your code and re-printing it with its own rules that take the max...
fuelux : Extends Twitter Bootstrap with additional lightweight JavaScript controls. Easy to install, customize, update, and optimize. All functionality covered...
ESBench : Shareable JavaScript Benchmarking
Built-in ES2015 support, powered by Babel
Statistically significant benchmarks, powered by Benchmark.js
tracing-framework : Rich tools for instrumenting, analyzing, and visualizing web apps.
DOM Monster is a cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of health.