Packager is a project mainly written in PHP, it's free.
Builds one css or js file out of many
This is all kinda ghetto right now but check it…
Fill out the packages array with your information:
public static $packages = array( 'js' => array( 'file_type' => 'js', 'package' => array( 'version' => 6, 'directory' => '/js/', 'extension' => 'js', 'base_file_name' => 'package' ), 'assets' => array( 'files' => array( 'jQuery.js', 'lightbox.js', 'myCoolTool.js', 'myAwesomeClass.js' ) ) ) );
To get the most up to date file, you can use it like such:
Whenever you want to generate a new package (bumping the cache), just increment the version number in $packages['MYPACKAGENAME']['package']['version']