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.
Sticky headers plugin adds sticky or fixed header to your site with custom settings.
A simple but effective Calendar plugin for WordPress that allows you to manage your events and appointments and display them to the world.
This Plug-in enables your website to easily integrate with the Referboard platform and get your products online quicker.
The Personality Quiz add-on for Gravity Forms lets you create simple, un-graded personality quizzes (think Buzzfeed-style quizzes).
A simplest and easiest way to add responsive accordion FAQ and question answer to your faq page or post with shortcode
Sticky Menu (Or Anything!) On Scroll will let you choose any element on your page that will be "sticky" at the top once you scroll down.