1)   Jasob JavaScript Obfuscator 3.5.1
Jasob JavaScript Obfuscator is a popular tool, enabling JavaScript and CSS driven Web pages to be compressed and obfuscated into supertight, bandwidth-optimized code concealing its scripting and increasing the speed of Web site loading.

 2)   Javascript Obfuscator 4.2
Scramble, obfuscate, and pack JavaScript code! Javascript Obfuscator converts the JavaScript source code into scrambled and completely unreadable form, preventing analysis and theft.