You can use this from your pc, to run this you will need java (jre) in your pc, i built this using java 7 so earlier versions of java will NOT be able to run it.
No installation required just download and click. Grab the tool from here, the jar version is for all operating system, but i also built an exe of it but it will still require java. (jre 7)
How it works:
At first i tried to reverse engineer the whole compiler just like i did for the css-minimizer but well its a huge thing, thousands of Classes inside it. I felt lost, but there was a easy way out, Google provides a REST api for it, and I decided to use it. So that means this GUI tool can’t work offline (unless you select the merge option), when you select .js files and press the compile buttons it merge all the js files and requests Google and then saves the response.
Okay now try it. and give me feedback and suggestions. Thanks