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.
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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.
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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.

Juliette Reinders Folmer

Subharanjan

This plugin adds two more tabs in the Debug Bar to display hooks(Actions and Filters) attached to the current request. Actions tab displays the actions hooked to current request. Filters tab displays the filter tags along with the functions attached to it with respective priority.
<h4>Important</h4>
This plugin requires the <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar</a> plugin to be installed and activated.
Also note that this plugin should be used solely for debugging and/or in a development environment and is not intended for use on a production site.
If you like this plugin, please <a href="https://wordpress.org/support/view/plugin-reviews/debug-bar-actions-and-filters-addon" rel="ugc">rate and/or review</a> it. If you have ideas on how to make the plugin even better or if you have found any bugs, please report these in the <a href="https://wordpress.org/support/plugin/debug-bar-actions-and-filters-addon" rel="ugc">Support Forum</a> or in the <a href="https://github.com/subharanjanm/debug-bar-actions-and-filters-addon/issues" rel="nofollow ugc">GitHub repository</a>.

Debug Bar Actions and Filters Addon

Awesome

Displays all the hooks( Actions and Filters ) for the current request in Debug Bar panel.

Debug Bar – Sidebars & Widgets vs Debug Bar Actions and Filters Addon