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...
Flow : Adds static typing to JavaScript to improve developer productivity and code quality.
JavaScript Code Style checker : jscs is a code style checker. jscs can check cases, which are not implemented in jshint, but it does not duplicate jshint functionality, so you should...
ESBench : Shareable JavaScript Benchmarking
Built-in ES2015 support, powered by Babel
Statistically significant benchmarks, powered by Benchmark.js
Comby : Comby is a tool for matching and rewriting code.
Beautify, unpack or deobfuscate JavaScript and HTML, make JSON/JSONP readable, etc.