Free JavaScript Obfuscators

A List of Free JavaScript Obfuscators Compressors, Packers, Encryptors, Protectors, Optimizers!

A free and efficient obfuscator for JavaScript (including ES6):
https://javascriptobfuscator.herokuapp.com/

Web based tool to protect JavaScript code from stealing and shrinks size:
http://javascriptobfuscator.com

JavaScript Obfuscator - JS Packer:
http://packer.50x.eu/

Convert human readable javascript to a more shrouded code:
http://www.daftlogic.com/projects-online-javascript-obfuscator.htm

ObfuscateJS - Javascript Obfuscator:
http://tools.2vi.nl/

Inline JavaScript Obfuscator:
http://www.wiseloop.com/demo/php-javascript-obfuscator
 
JavaScript Obfuscator, Minifier, and Packer:
http://www.addressmunger.com/javascript_obfuscator/

YUI Compressor by Yahoo:
http://yui.github.io/yuicompressor/

JavaScript Utility:
http://jsutility.pjoneil.net/

A JavaScript Compressor, version 3.0:
http://dean.edwards.name/packer/
https://github.com/jcoglan/packr

Javascript-Encrypter:
http://www.toolzzz.net/en/jsPacker.htm

Javascript Obfuscation and Compression:
http://www.obfuscriptor.com/ 

Free online javascript and html obfuscator:
http://obfuscatorjavascript.com/

Hackvertor:
http://www.businessinfo.co.uk/labs/hackvertor/hackvertor.php

Free online html/js obfuscator:
http://htmlobfuscator.com/

JSMin - The JavaScript Minifier:
http://www.crockford.com/javascript/jsmin.html

HaxMin - JavaScript obfuscator, powered by Haxe, intended for use with Haxe-generated JavaScript code:
https://github.com/YellowAfterlife/HaxMin

JavaScript minification:
http://marijnhaverbeke.nl/uglifyjs

The impressive js segment compiler:
http://player.opengg.me/js.segment.compiler/

A JavaScript optimizer by Google:
https://developers.google.com/closure/?csw=1

A JavaScript optimizer by Facebook (update on 2017/5/4):
https://prepack.io/

Want to test the results? Try the following de-obfuscator (Via http://stackoverflow.com/a/6010218):
http://jsbeautifier.org/
https://beautifier.io/

A review and how to combine the power of multiple obfuscators:
http://techyzilla.blogspot.com/2012/09/better-javascript-obfuscating-method-to-protect-your-code.html

Code Protection and Packaging for Node.js Projects with JXCore:
http://flippinawesome.org/2014/04/21/code-protection-and-packaging-for-node-js-projects-with-jxcore/

JS & CSS Minifier:
https://www.websiteplanet.com/webtools/jscssminifier/

Links:
http://javaencrypt.com/
http://m.cg/post/18769268750/why-javascript-obfuscation-is-not-just-pointless-but
http://www.mcdonaldland.info/2008/07/03/writing-a-javascript-obfuscator
http://stackoverflow.com/questions/522064/what-is-the-best-javascript-obfuscator
http://stackoverflow.com/questions/194397/how-can-i-obfuscate-javascript
http://www.codeproject.com/Articles/863295/Hack-proof-your-Javascript-using-javascript-Obfusc
http://dean.edwards.name/
https://codebeautify.org/

Feel free to share your tools/opinions in the comments!