Adminer is a full-featured MySQL management tool written in PHP. This plugin include this tool in WordPress.

Extreme Advanced debugging plugin for seeing the verbose of the verbose debug info. Tech Support, Server Admins, WordPress Developers, Plugin Developers, or anyone wanting to see under the hood of their website and diagnose problems. This debugging plugin goes further than any other in the way it uses Apache Server Status Handlers, CGI Script for server environment view, and in the shear amount of debugging information available, like the basically print_r($GLOBALS).

Displays information on both front and back ends during development, such as memory usage, number of database queries and more.

Admin-only tool for checking execution times and error output of current theme/plugins

Outputs some database query information on page load for logged in admins. Output is located as an html comment in the footer and also in the console.

Monitor Scripts, Styles, Queries, and more during Development

Shortcode to count number of posts that match a given set of criteria; provides link to query to display list of matching posts

The Plugin Debug Objects provides a large number of information: query, cache, cron, constants, hooks, functions and many more.

Takes incoming queries from search engines and adds these queries as tags to that post.

Decisions not options for query and hook logging

End subscription payments after a certain number of payments

Add a unique piece of text or code to each gravity form from a predefined list. The plugin keeps track of which have been used and will only include unused items.

Create independent query of posts and pages mixing taxonomies, standard categories, custom values, etc. with shortcode.

Used to profile MySQL queries for performance; with backtrace information for each query (caller functions, lines, file names etc.)

Development environment for Wordpress developers

Indabug is the debug console for WordPress.

Peek under the hood with sixty debugging reports just one click away.

"Silver Bullet" is the missing plugin for every WordPress website.

Some additional queries for Gravity Forms like getting recurring payment notifications

Helper plugin that provides conditional functions for detecting a variety of mobile devices & tablets. Perfect accompaniment to CSS Media Queries.