Developer WordPress Plugins
Query Monitor
Get a running list of MySQL queries on each page using a link in your admin bar. Groups queries together by different parameters and troubleshoot performance issues and errors.
System Snapshot Report
Get information about your WordPress install, with additional information about your server and browser, including detailed info about PHP configuration and WP Config info.
Attachments
Associate posts with media attachments and metadata, then output this data in your theme files using an extensive API with several functions and a custom Loop.
Theme Mentor
A perfect companion to Theme Check, find some common errors that plagues theme development, and easily find where in your theme file the problem is located so you can make it a quick fix. Check any theme installed on WordPress.
Broken Link Checker
Check for broken links in your site, and list them all in one place. Make quick checks and fixes, and specify exactly where on your WordPress install to check and how often.
UK Cookie Consent
Let your users know about the use of cookies on your site with a simple to use and customizable fixed bar that informs every user to the site that cookies are being used, and links to a pre-populated page with more information.
Widget Logic
Use custom PHP or WordPress' built-in conditional tags in order to add logic to any widget in the admin screen. Code can be entered in a provided text box, and is automatically paired to the corresponding widget.
Helpful Information
For each page on your site, access information that can help you diagnose and fix problems. View theme information, WordPress queries, PHP included files and style and scripts that are loaded in.
Responsive Page Tester
View your page at different screen sizes right within your browser window automatically. Just chose the size you want to test your site at, or see them all at once, using a drop-down menu in your admin bar.
Optimize Database
Sweep your WordPress install for superficial data stored in your database and make your site run faster and customizable. Tweak the optimization settings, and exclude any tables from being touched by the plugin at all if it stores sensitive data.
Post Snippets
Add snippets of code or custom shortcodes by adding code samples in your admin panel. A basic templating language allows you to specify where variables should be inserted into code, and adds a button to TinyMCE to add snippets to posts.
Theme-Check
If you are developing a WordPress theme, you need to make sure that your theme is compliant with the Theme Review Guidelines. This plugin automatically checks to make sure your theme is up to spec. in your admin panel.