Protopack JS is set of UI components for Prototype JS framework. It is open source and publishes under the MIT license.
WYUI Compressor is a Windows UI for Yahoo!'s YUI Compressor. It minifies your JS/CSS files in just one click rather than using complicated command line. There are also some online versions of Yahoo!'s YUI Compressor but the benefit of a Windows based application is that you don't have to upload your source codes on to the web.
Want to name your files with a particular pattern? Batch Rename is a small Windows program used to rename a group of files or directories. It is smart and easy to use.