Wordpress Plugins 
Mozilla Firefox Addons 
Google chrome Extensions 
All in One SEO Pack The most downloaded plugin for WordPress (almost 30 million downloads). Use All in One SEO Pack to automatically optimize your site for Search Engines
Total Downloads: 30M Download Plugin
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
StatCounter - Free Real Time Visitor Stats StatCounter.com powered real-time detailed stats about the visitors to your blog.
Total Downloads: 1.1M Download Plugin
Calendar A simple but effective Calendar plugin for WordPress that allows you to manage your events and appointments and display them to the world.
Total Downloads: 563.5K Download Plugin
Shadowbox JS Shadowbox is an online media vieiwing application similar to Lightbox and Thickbox but with more functionality. Supports all types of media.
Total Downloads: 518.7K Download Plugin
Gallery - Video Gallery Gallery Video plugin was created and specifically designed to show video links in unusual splendid gallery types supplemented of many gallery options
Total Downloads: 422.6K Download Plugin
Total Downloads: 411.8K Download Plugin
Contact Form Clean and Simple A clean and simple AJAX contact form with Google reCAPTCHA, Twitter Bootstrap markup and Akismet spam filtering.
Total Downloads: 354.8K Download Plugin
Media Library Assistant Enhances the Media Library; powerful [mla_gallery], taxonomy support, IPTC/EXIF/PDF processing, bulk/quick edit actions and where-used reporting.
Total Downloads: 349K Download Plugin
Raw HTML Lets you use raw HTML or any other code in your posts. You can also disable smart quotes and other automatic formatting on a per-post basis.
Total Downloads: 336.6K Download Plugin
Backup & Restore Dropbox Backup & Restore Dropbox Plugin to create Dropbox Full Backup (Files + Database) or Restore, Duplicate, Clone or Migrate of your Website
Total Downloads: 302.4K Download Plugin
Video Sidebar Widgets Video Sidebar Widgets to display videos such as Vimeo, YouTube, MySpace Videos etc. Now with added shortcode and quicktag to embed video in post and p
Total Downloads: 302.4K Download Plugin
Total Downloads: 298.2K Download Plugin
Configure SMTP Version: 3.1 Configure SMTP mailing in WordPress, including support for sending e-mail via SSL/TLS (such as GMail).
Total Downloads: 297.2K Download Plugin
Google XML Sitemaps v3 for qTranslate This plugin will generate a special XML sitemap which will help search engines to better index your blog. With qTranslate support.
Total Downloads: 290.8K Download Plugin
Category Order The Category Order plugin allows you to easily reorder your categories the way you want via drag and drop.
Total Downloads: 284.2K Download Plugin
Post Thumbnail Editor Fed up with the lack of automated tools to properly crop and scale post thumbnails? Maybe this plugin can help.
Total Downloads: 283.7K Download Plugin
WP-Cycle This plugin creates an image slideshow in your theme, using the jQuery Cycle plugin. You can upload/delete images via the administration panel, and di
Total Downloads: 225K Download Plugin