Speed up your site (BIG time!) — Quick Cache provides reliable page caching for WordPress. Easy-to-use (very simple installation).
Advanced debugging plugin for seeing the verbose of the verbose debug info. Tech Support, Server Admins, WordPress Developers, Plugin Developers, or
MySQL queries and load details added to your admin bar.
Debug your plugin with the help of Debug Bar. Puts debugging messages in the drop down Debug Bar interface.
A WordPress plugin that makes var_dump and print_r pretty!
It's important for a non technical administrator to be able to diagnose server related problems in WordPress.
Inpect hidden information of your WordPress websites for debugging
BlackBox is a plugin for plugin and theme developers. It collects and displays useful debug information (errors, executed queries, globals, profiler).
See which plugins are slowing down your site. This plugin creates a performance report for your site.
An unobtrusive debugging tool for WordPress that leverages UDP
Plugin for debugging. Showing the value of all PHP constants. Useful for instance for solving problems when upgrading or when changing webhoster.
Displays a list of each page's SQL queries and the functions calling them that can be searched and sorted by time, type, etc.
A simple plugin that reports the call stack trace when PHP errors occur.
Adds PHP profiling support to your WordPress using Facebook's XHProf Profiler.
Log variables and view the results in your admin interface
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