Shortcode Developer is a WordPress plugin by Elliot Condon provides a user friendly interface for creating custom shortcodes. Each shortcode consists of a name, a list of attributes (with names and default values) and the PHP code executed to return the html back to the shortcode placeholder.
A nice advantage of using this plugin over writing the shortcodes into the functions.php is that the shortcodes are not dependent on the theme
Download: http://wordpress.org/extend/plugins/shortcode-developer/
