I need the up-to-date UsabilityInitiative extension

When I went to the UsabilityInitiative page to download the extension, I noticed that it is not for the current release of mediawiki. Where can I find the extension matching the current release of mediawiki?

The extension no longer exists, it was an group of different experiments during development of MediaWiki 1.16, the current development cycle is MediaWiki 1.21.

Please read the notice on top of Extension:UsabilityInitiative. The different features have been extracted in to separate stand-alone extensions. Pick the ones you need and install them (the configuration is not backwards compatible, be sure to update your settings accordingly).