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.
Nofollows category links across the site. Adds Noindex to category pages.
Installs the TranslateThis Button, a Javascript/AJAX translation widget. Provides 52 languages of translation with many customizable options.
Smart Youtube is a professional WordPress Video plugin that allows you to easily insert videos/playlists into your post from all major video services.
This is a simple plugin that provides an A-Z index of the posts displayed on a particular page based on the post title.
This simple plugin allow you to insert a google static map with a simple shortcode. A few parameters to setup and you've got it!
A suite of word counters, keyword counters and readability analysis for your blog.