Cross-platform E-mail, database and web server that supports Server-side Javascript to build Internet applications in an object-oriented, web-based content management system.

Implementation of the ECMA 262 scripting language. Both standalone and ActiveScript versions are available. By Digital Mars.

A full implementation of the EcmaScript language.

A JavaScript-compatible language implementation for the .NET platform. It is intended to run on any implementation of the core .NET platform, such as Portable.NET or Mono, as well as the Microsoft implementation. [Open source, GPL]

NJS is an independent implementation of the JavaScript language developed by Netscape and standardized by ECMA. NJS is designed to be re-entrant, extendible, fast, and programmable.

An open-source implementation of JavaScript written entirely in Java.

A standalone JavaScript interpreter for many platforms.

A small C library that provides a JavaScript parser and runtime environment, conforming to ECMAScript Edition 3 and JavaScript 1.5, and with compatibility modes for JScript et al. [Open source, BSD-style licence]