jVariations is a developer tool that generates a control panel (with checkboxes and radio buttons) to show and hide variations (aka corner cases) in a single HTML template.
Why? When providing HTML templates to server-side engineers I got tired of having separate files to show variations... think error messages, alternative messaging, varying number of tab sets, etc. Using jVariations, you can provide simple variations in one file and use the convenient control panel to toggle visibility. <http://cherne.net/brian/resources/jquery.variations.html> I haven't actually used this in a real-world situation... so I'm not sure if it'll actually be useful. But I wanted to share it with the community in case other's could find a use for it. Cheers, Brian.