Wordpress Plugins 
Mozilla Firefox Addons 
Google chrome Extensions 
NextGEN Gallery The most popular WordPress gallery plugin and one of the most popular plugins of all time with over 15 million downloads.
Total Downloads: 15.7M Download Plugin
Google Analytics by MonsterInsights Connect Google Analytics with WordPress by adding your Google Analytics tracking code. Get the stats that matter.
Total Downloads: 12.1M Download Plugin
Google Analytics Dashboard for WP Displays Google Analytics reports in your WordPress Dashboard. Inserts the latest Google Analytics tracking code in your pages.
Total Downloads: 5.8M Download Plugin
AddToAny Share Buttons Share buttons for WordPress including the AddToAny sharing button, Facebook, Twitter, Google+, Pinterest, WhatsApp, many more, and follow icons too.
Total Downloads: 5.4M Download Plugin
Total Downloads: 3.9M Download Plugin
WP Smush - Image Optimization Reduce image file sizes, improve performance and boost your SEO using the free WPMU DEV WordPress Smush API.
Total Downloads: 3.9M Download Plugin
Redirection Redirection is a WordPress plugin to manage 301 redirections and keep track of 404 errors without requiring knowledge of Apache .htaccess files.
Total Downloads: 3.8M Download Plugin
NextScripts: Social Networks Auto-Poster Automatically publishes blogposts to profiles/pages/groups on Facebook, Twitter, Instagram, Google+, Pinterest, LinkedIn, Blogger, Tumblr ... 22 more
Total Downloads: 3.1M Download Plugin
Total Downloads: 2.6M Download Plugin
ManageWP Worker ManageWP is the ultimate WordPress productivity tool, allowing you to efficiently manage your websites.
Total Downloads: 2.3M Download Plugin
Shareaholic | share buttons, related posts, social analytics & more World's leading all-in-one Content Amplification Platform that helps grow your site traffic, engagement, conversions & monetization for FREE.
Total Downloads: 2.3M Download Plugin
Sociable Congrats for joining the leader in the sharing space of WordPress plugins. "Sociable" is totally FREE, has over 1,7 million downloads and no
Total Downloads: 2.2M Download Plugin
YouTube YouTube Embed WordPress Plugin. Embed a responsive video, YouTube channel gallery, or playlist gallery. Add thumbnails, analytics, caching...
Total Downloads: 1.7M Download Plugin
All-in-One Event Calendar A calendar system with many views, upcoming events widget, color-coded categories, recurrence, and import/export of .ics feeds.
Total Downloads: 1.7M Download Plugin
Total Downloads: 1.6M Download Plugin
Xhanch - My Twitter The best plugin to display your latest tweets, replies, direct messages, retweets, auto and manual tweet and lots more. Support multiple accounts
Total Downloads: 1.6M Download Plugin
WordPress Related Posts WordPress Related Posts - the plugin for related posts with thumbnails. Caching included.
Total Downloads: 1.6M Download Plugin
Responsive Lightbox by dFactory Responsive Lightbox allows users to view larger versions of images and galleries in a lightbox (overlay) effect optimized for mobile devices.
Total Downloads: 1.5M Download Plugin