ChakraCore is an open source Javascript engine with a C API.

Async/await for ECMAScript

Notepad++ official repository

Status, process, and documents for ECMA 402

The ESTree Spec

Manage license headers in your source files

A programmer-oriented testing framework for Java — ⚠️ maintenance mode

Joda-Time is the widely used replacement for the Java date and time classes prior to Java SE 8.

Java port of Oniguruma regexp library

JRuby, an implementation of Ruby on the JVM

[ARCHIVED] PluotSorbet is a J2ME-compatible virtual machine written in JavaScript.

ECMAScript compatibility tables

A source code transpiler that enables the use of ES2015 Unicode regular expressions in ES5.

The ES6 promises spec, as per September 2013 TC39 meeting

args4j

Jline 2.x

an ahead of time compiler and runtime for ES6

TC39 meeting agendas

Content for the ebook "Understanding ECMAScript 6"

Traceur is a JavaScript.next-to-JavaScript-of-today compiler

An aggregation of tooling for using ES6 today

Status, process, and documents for ECMA-262

Higgs JavaScript Virtual Machine

Official ECMAScript Conformance Test Suite

ECMAScript in HTML

Pseudoimplementation of the proposed ES6 module loaders.

Find and fix problems in your JavaScript code.

JUnit project to run test262

Rhino is an open-source implementation of JavaScript written entirely in Java

Shumway is a Flash VM and runtime written in JavaScript