WordPress is one of the most widely used Content Management System for web development. It comes with a huge collection of plugins to tailor the website as per user's requirements. But it becomes quite difficult to choose few plugins from such a set without learning about the features of each of them..

So here's a list of TOP 7 Plugins which are used extensively by WordPress Developers.
http://www.girnarsez.com/blog/wordpress-plugins-for-web-development/