Jesper van Engelen

The Sidebars & Widgets extension for the Debug Bar shows you all you need to know about the sidebars and widgets on the current page. It shows the sidebars displayed and the widgets displayed in them, and tells you whether all widgets in the sidebar were actually displayed.
This plugin allows you to analyze the behaviour of your WordPress sidebars and wigets, and is aimed at WordPress developers.
<blockquote>
This plugin is an extension to the <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar plugin</a>, which is required for this plugin to work.
</blockquote>
This plugin integrates nicely with <a href="https://wordpress.org/plugins/content-aware-sidebars/" rel="ugc">Content Aware Sidebars</a>, telling you what sidebars were replaced and merged. It is an essential plugin if you use Content Aware Sidebars with a big number of sidebars.

Debug Bar – Sidebars & Widgets

Debug Bar extension that adds information about the sidebars and widgets on the current page. Integrates with Content Aware Sidebars plugin.

10up

Helen Hou-Sandi

Zack Tollman

Debug Bar Cron adds information about WP scheduled events to a new panel in the Debug Bar. This plugin is an extension for 
Debug Bar and thus is dependent upon Debug Bar being installed for it to work properly.
Once installed, you will have access to the following information:
<ul>
<li>Number of scheduled events</li>
<li>If cron is currently running</li>
<li>Time of next event</li>
<li>Current time</li>
<li>List of custom scheduled events</li>
<li>List of core scheduled events</li>
<li>List of schedules</li>
</ul>

Debug Bar Cron

This has been great for checking if WordPress's scheduled events are firing. Good for checking if you need to setup a real cron job or if that real cron job is failing. Very clear presentation.

Great for checking if scheduled events running

Debug Bar Cron adds a new panel to Debug Bar that displays information about WP scheduled events.

Debug Bar – Sidebars & Widgets vs Debug Bar Cron