Debug your plugin with the help of Debug Bar. Puts debugging messages in the drop down Debug Bar interface.
Lists WordPress require() calls mainly for plugin code refactoring
Extreme Advanced debugging plugin for seeing the verbose of the verbose debug info. Tech Support, Server Admins, WordPress Developers, Plugin Develop
See which plugins are slowing down your site. This plugin creates a performance report for your site.
MySQL queries and load details added to your admin bar.
View debugging and performance information on database queries, hooks, conditionals, HTTP requests, redirects and more.
Add bbPress and BuddyPress Conditionals to John Blackbourn's awesome Query Monitor
Making collecting extensive and extendable debug info finally easy.
Speed up your site (BIG time!) — Quick Cache provides reliable page caching for WordPress. Easy-to-use (very simple installation).
Speed up your blog with Easy Cache, bullet-proof and easy-to-use website caching mechanism for WordPress that just works.
Inpect hidden information of your WordPress websites for debugging
Install and manage development plugins
An unobtrusive debugging tool for WordPress
Adds a system information page that include all the details on your WordPress configuration.
A simple plugin that reports the call stack trace when PHP errors occur.
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