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.
myStickyElements is simple yet very effective plugin. It is perfect to fill out usually unused side space on webpages with some additional messages
Add Bing Website Translator to your website, and make it instantly available in 40+ languages. Adding the translator is quick and easy.
Use the SecSign ID two-factor authentication on your WordPress site to enable easy and secure login using your iPhone or Android phone.
Expand tabs is an easy tabs plugin for your WordPress website. Just use shortcode & see the awesomeness!
Disable login by certain users. Useful when you are moving a client site and don't want anyone to make any edits to the WordPress database.
WP Simple Mail Sender is a very simple plugin to change the sender address and name in outgoing emails.