I wrote an article about extending the functionality of the basic WordPress install. Rather than trying to keep that list up to date, another plugin is used to display plugins installed, both active and inactive - dynamically.There are 48 plugins used: 34 active plugins and 14 inactive plugins.
» Automattic (url)
Used by millions, Akismet is quite possibly the best way in the world to protect your blog from comment and trackback spam. It keeps your site protected from spam even while you sleep. To get started: 1) Click the “Activate” link to the left of this description, 2) Sign up for an Akismet API key, and 3) Go to your Akismet configuration page, and save your API key.
Better WP Security 3.6
» iThemes (url)
Helps protect your Wordpress installation from attackers. Hardens standard Wordpress security by hiding vital areas of your site, protecting access to important files via htaccess, preventing brute-force login attempts, detecting attack attempts, and more.
Dean's Permalinks Migration 1.0
» Dean Lee (url)
With this plugin, you can safely change your permalink structure without breaking the old links to your website,and even doesn’t hurt your google pagerank.
Future Calendar 1.6.3
» Aaron Harun (url)
A simple plugin that utilizes a modified get_calendar function that shows what dates have a future post scheduled in a calendar format, and makes it easy to change the current timestamp. Includes a widget to display posts on your website.
Google Analytics for WordPress 4.3.3
» Joost de Valk (url)
This plugin makes it simple to add Google Analytics to your WordPress blog, adding lots of features, eg. custom variables and automatic clickout and download tracking.
Simple Page Ordering 2.1.2
» Jake Goldman, 10up (url)
Order your pages and hierarchical post types using drag and drop on the built in page list. For further instructions, open the “Help” tab on the Pages screen.
Smart 404 0.5
» Michael Tyson (url)
Rescue your viewers from site errors! When content cannot be found, Smart 404 will use the current URL to attempt to find matching content, and redirect to it automatically. Smart 404 also supplies template tags which provide a list of suggestions, for use on a 404.php template page if matching content can’t be immediately discovered.
W3 Total Cache 0.9.3
» Frederick Townes (url)
The highest rated and most complete WordPress performance plugin. Dramatically improve the speed and user experience of your site. Add browser, page, object and database caching as well as minify and content delivery network (CDN) to WordPress.
What The File 1.4.0
» Barry Kooij (url)
What The File adds an option to your toolbar showing what file and template parts are used to display the page you’re currently viewing. You can click the file name to directly edit it through the theme editor. Supports BuddyPress and Roots Theme. More information can be found at the WordPress plugin page.
WP to Twitter 2.7.7
» Joseph Dolson (url)
Posts a Tweet when you update your WordPress blog or post to your blogroll, using your URL shortening service. Rich in features for customizing and promoting your Tweets.
» Andrew Turner & Mikel Maron (url)
GeoPress adds geographic tagging of your posts and blog. You can enter an address, points on a map, upload a GPX log, or enter latitude & longitude. You can then embed Maps, location tags, and ground tracks in your site and your blog entries. Makes your feeds GeoRSS compatible and adds KML output. (http://georss.org/geopress )
Organize Series 2.4.6
» Darren Ethier (url)
This plugin adds a number of features to wordpress that enable you to easily write and organize a series of posts and display the series dynamically in your blog. You can associate “icons” or “logos” with the various series. This version of Organize Series Plugin requires at least WordPress 3.4+ and PHP 5.2+ to work.
P3 (Plugin Performance Profiler) 1.4.1
» GoDaddy.com (url)
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.
WP Show IDs 110709
» PriMoThemes.com / WebSharks, Inc. (url)
Simple, yet elegant. Shows IDs for Posts, Pages, Media, Links, Categories, Tags, and Users in the admin tables for easy access. Very lightweight. Also supports Custom Post Types / Taxonomies.
I have left comments open on this, so if you feel the need to ask why or how a plugin is used then fire away.