Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
Allows admins to create private pages for individual users that only that user and admins can access.
Helps you write great content with search engines in mind. Keyword distribution and keyword density will help you.
WPG cool gallery for photos and videos (YouTube & vimeo) management with attractive responsive design.
This simple plugin is a widget that displays a list of random posts on your widgetized sidebar. It supports multiple instances with WordPress 2.
With this plugin it is possible to automatically fill in the title attribute of a link in WordPress editor. This plugin requires PHP5.3+
Gives you the ability to clone posts, and replace posts. Together, you have a very powerful tool for a fork/merge editing model.