Allow 404 errors to redirect to a specific page (as a 301).
Create custom 401 and 403 error pages with any WordPress theme without writing a single line of code, set it up and forget it.
Timber is a general-purpose error-logging and alert system for WordPress.
One click enable/disable debugging, clear debug.log, search, sort, and filter errors. See new errors automatically without refreshing.
Browser Blocker allows you to pick and choose which browsers(versions) can access your web page and which ones are given a blocked splash screen.
Extreme Advanced debugging plugin for seeing the verbose of the verbose debug info. Tech Support, Server Admins, WordPress Developers, Plugin Develop
Puts a ribbon on the website if the user browser is older than expected.
Create more useful 404 error pages, including email notifications for bad links.
A tool for logging and monitoring custom errors, making debugging complex PHP a breeze.
Display comment form errors nicely!
Put W3 Total Cache on auto pilot. This plugin allows you to control W3 Total Cache by simply using your website. So your cache is always up to date.
Shows generated php site errors only to the admin via a drop down panel and hides them from the public. Email Alerts the admin of errors.
Development tool for WordPress to track bugs, manage crons, permalinks and much more.
Taming WordPress and PHP errors and displaying them properly.
Prevents plugins from showing deprecated errors in the WordPress admin.
Airbrake collects errors created by WordPress and it's plugins.
Making WordPress websites...better.
Version: 1.0 Catches php errors, and reports last 25. Can also email the results. Good for debugging themes and plugins.
Display PHP errors as WordPress admin alerts
Add capability to capture technical problems faced by users on any post or pages on the WordPress website / blog.
Basic Developer Tools helps developers to log any variable, error or exception of which they need the value, without bloating their live environment.
This plugin automatically grabs all errors created by WordPress, WordPress plugins, and WordPress Themes and notifies you in realtime.
Making betterify WordPress websites... a little worser.
Easy to check crawling errors of website and export the information to CSV type file