Thanks to the developers of these plugins!

Used by millions, Akismet is quite possibly the best way in the world to protect your blog from spam. Akismet Anti-spam keeps your site protected even while you sleep. To get started: activate the Akismet plugin and then go to your Akismet Settings page to set up your API key.

By Automattic – Anti-spam Team.

Don’t like Howdy? Change it to whatever you want. Wordpress 3.3+ compatible!

By Shibu Lijack a.k.a CyberJack.

Use Google AdSense and other Google tools with your WordPress site.

By Google.

Allows you to create customizable magazine-style pull-quotes without duplicating text in your markup or feeds.

By Stephen Rider.

We help you efficiently manage all your WordPress websites. Updates, backups, 1-click login, migrations, security and more, on one dashboard. This service comes in two versions: standalone ManageWP service that focuses on website management, and GoDaddy Pro that includes additional tools for hosting, client management, lead generation, and more.

By GoDaddy.

See which plugins are slowing down your site. Create a profile of your WordPress site’s plugins’ performance by measuring their impact on your site’s load time.

By GoDaddy.com.

Posts Order and Post Types Objects Order using a Drag and Drop Sortable javascript capability

By Nsp Code.

Lightweight SSL & Hardening Plugin

By Really Simple Plugins.

Easily add pull quotes to blog posts using shortcode.

By Toby Cryns.

Social Login allows your users to comment, login and register with 40+ social networks like Twitter, Facebook, LinkedIn, Instagram, Вконтакте, Google or Yahoo.

By OneAll Social Login .

Creates an alternate login, registration and password recovery experience within your theme.

By Theme My Login.

Adds reCAPTCHA support to Theme My Login.

By Theme My Login.

Backup and restore: take backups locally, or backup to Amazon S3, Dropbox, Google Drive, Rackspace, (S)FTP, WebDAV & email, on automatic schedules.

By UpdraftPlus.Com, DavidAnderson.

Shows all installed plugins with a signle shortcode. [pluginlist] to show all, [pluginlist show="active"] to show only activated plugins and [pluginlist show="inactive"] to show all inactive plugins.

By H.-Peter Pfeufer.

This plugin improves SEO using sitemaps for best indexation by search engines like Google, Bing, Yahoo and others.

By Auctollo.

Adds related posts to your site and in RSS feeds, based on a powerful, customizable algorithm.

By YARPP.

The first true all-in-one SEO solution for WordPress, including on-page content analysis, XML sitemaps and much more.

By Team Yoast.