WordPress.org

This is not just a plugin, it symbolizes the hope and enthusiasm of an entire generation summed up in two words sung most famously by Louis Armstrong.

By: Matt Mullenweg.

Adds a more advanced paging navigation interface.

By: Lester Chan and scribu.

Track your WordPress site easily with the latest tracking codes and lots added data for search result pages and error pages.

By: Joost de Valk.

Import posts, pages, comments, custom fields, categories, tags and more from a WordPress export file.

By: WordPress.org.

Allows you to regenerate your thumbnails after changing the thumbnail sizes.

By: Alex Mills (Viper007Bond).

This plugin will generate a special XML sitemap which will help search engines to better index your blog.

By: Arne Brachhold.

Improve your WordPress SEO: Write better content and have a fully optimized WordPress site using Yoast SEO plugin.

By: Joost de Valk.

Customise WordPress with powerful, professional and intuitive fields

By: elliotcondon.

Really Simple CAPTCHA is a CAPTCHA module intended to be called from other plugins. It is originally created for my Contact Form 7 plugin.

By: Takayuki Miyoshi.

WooCommerce is a powerful, extendable eCommerce plugin that helps you sell anything. Beautifully.

By: automattic, Mike Jolley, jameskoster, Claudio Sanches, royho, and WooThemes.

Easy Web Performance Optimization (WPO) using caching: browser, page, object, database, minify and content delivery network support.

By: Frederick Townes.

Akismet checks your comments against the Akismet Web service to see if they look like spam or not.

By: Matt Mullenweg, Ryan Boren, Andy Skelton, Michael Adams (mdawaffe), and others.

Your WordPress, Simplified.

By: automattic, aduth, Alex Kirk, allendav, alternatekev, Andy Skelton, and others.

All in One SEO Pack is a WordPress SEO plugin to automatically optimize your WordPress blog for Search Engines such as Google.

By: Michael Torbert.

A very fast caching engine for WordPress that produces static html files.

By: Donncha O Caoimh, automattic, and Brandon Kraft.

Enables the advanced features of TinyMCE, the WordPress WYSIWYG editor.

By: Andrew Ozz.

The Wordfence WordPress security plugin provides free enterprise-class WordPress security, protecting your website from hacks and malware.

By: Wordfence.

The most popular WordPress gallery plugin and one of the most popular plugins of all time with over 13 million downloads.

By: photocrati.

Just another contact form plugin. Simple but flexible.

By: Takayuki Miyoshi.

Clone posts and pages.

By: Lopo.

Allows administrators to globally disable comments on their site. Comments can be disabled according to post type. Multisite friendly.

By: Samir Shah.

Multibyte functionality enhancement for the WordPress Japanese package.

By: Seisuke Kuraishi (tenpura).

The visual editor widget for WordPress.

By: Marco Chiesi and Francesco Canovi.

Protect your WordPress site by hiding vital areas of your site, protecting access to important files, preventing brute-force login attempts, detecting

By: iThemes, Chris Jean, Aaron D. Campbell, gerroald, and Matt Danner.

Build responsive page layouts using the widgets you know and love using this simple drag and drop page builder.

By: Greg Priday and braam-genis.

Displays Google Analytics reports in your WordPress Dashboard. Inserts the latest Google Analytics tracking code in your pages.

By: Alin Marcu.

Easy to use WordPress slider plugin. Create SEO optimised responsive slideshows with Nivo Slider, Flex Slider, Coin Slider and Responsive Slides.

By: Matcha Labs.

Backup and restoration made easy. Complete backups; manual or scheduled (backup to S3, Dropbox, Google Drive, Rackspace, FTP, SFTP, email + others).

By: Backup with UpdraftPlus, David Anderson, DNutbourne, and LCahill.

Modern two-factor that people love to use: strong authentication without passwords or tokens; single sign on/off; magical user experience.

By: Dave Ross, Jesse Pollak, Andrew Russell, and Laurence.

Duplicate, clone, backup, move and transfer an entire site from one location to another.

By: corylamleorg and Bob Riley.