GO!Script is an IDE(Interactive Development Environment) for creating windows batch files,java/greasemonkey scripts,html files and php scripts.It also doubles up as a transparent text editor.It includes a testing environment and code snippets/libraries.

The key features of GO!Script are:
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IDE for creating batch files,javascripts and html files.
Code Snippet Library.
Testing Environment.
Cool Aero(customizable) Interface.

PHP Domain Redirection(you can do this even if you don't know PHP) 

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GO!Script is completely free.Created by Vivek Narayanan .