Smile 

Smile is a comprehensive development environment that provides a range of powerful production technologies and an intuitive approach to using them, allowing users to work faster and more efficiently, automate common tasks, and manage complex operations. Smile's features include an AppleScript editor with many helpful scripting tools, a custom AppleScript Terminal, a scripted interface editor, a text editor for ASCII and Unicode with a search-and-replace tool that supports Regular Expressions, a XML editor, a Regular Expression engine, and a XML and p-list engine.