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.
Adds a Google No Captcha ReCaptcha checkbox to your Wordpress login screen.
Search-Into-Subcategories plugin allows you to make a select-search shortcode for your own categories.
Checks if your image sizes have changed or if there was a new one added, if so it reminds you to go regenerate them.
Translitaration of greek characters to latin for post permalinks with some extra options. (greeklish)
META SEO is a plugin that helps you get more visitors through SERPs (Search Engine Results Page).