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.
Plugin that provides users option to display carousel widget for sidebar and carousel for page
Full screen background slideshow in any page/post, with images from WP Media Gallery, NextGEN Gallery, Flickr, Picasa, Smugmug, folder, or XML file
Widget displaying Belgian weather info, from IRM/KMI, Meteo Belgique/Meteo Belgie, and meteox.be
Easily add an author box bio signature with custom profile image and social profile buttons to the end of each author's posts
T&P Gallery Slider for WordPress is an image hover/click gallery as a WordPress plugin.
Enabling this plugin allows you to set up Basic authentication on your admin page using your WordPress user name and password.
Sanitize and rename automatically media files during upload using PHP time() as prefix and the file name encrypted in MD5() as suffix.
Prayer request management with counter. Alternatively, can be used as custom tweet platform.