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.
Easily move comments between posts and pages, change comment threading, and assign comments to different authors.
BuddyPress Group-O-Matic automatically adds members to groups based on extended profile field responses.
Easily add Constant Contact signup forms to your website (sidebar or content) and configure how they look.
This plugin lets you order the posts on the blog by manuallyl specified order.
Allows the user to insert a index of posts and categories on page/post.