Count Shortcode is a shortcode to count number of posts that match a given set of criteria.
Faceted Search Widget allows filtering of any search results of archive (tag, category, year, month, etc.) by any built in (category, tag) or custom taxonomies.
Force Strong Passwords forces users with executive capabilities to use something strong when updating their passwords.
Artiss YouTube Embed is an incredibly simple, yet powerful, method of embedding YouTube videos into your WordPress site.
Exploit Scanner searches the files on your website, and the posts and comments tables of your database for anything suspicious. It also examines your list of active plugins for unusual filenames.
Theme-Check allows you to run checks on the current theme before uploading to WordPress. This plugin uses the same API and is kept more or less in sync with the WordPress.org uploader tool.
UI Labs offers experimental WordPress admin UI features with the aim of building upon and enhancing the default WordPress User Interface. These are unofficial core UI experiments – who knows what could happen?
Ultimate Post Type Manager allows you to easily customize post types.
WPtouch automatically transforms your WordPress blog into an iPhone application-style theme, complete with ajax loading articles and effects, when viewed from an iPhone, iPod touch, Android, Opera Mini, Palm Pre, Samsung touch and BlackBerry Storm/Torch mobile devices.