Greg Winiarski

BlackBox is symfony like unobstrusive debug bar attached to the top of the browser window.
How can it help you with development: 
1. instantly inspect global variables (GET, POST, COOKIE, SERVER) 
2. debug both frontend and admin area 
3. executed MySQL queries and time it took to execute each query (useful for finding slow queries) 
4. profiler for measuring performance of your plugins and themes 
5. errors occurred when loading WordPress page

BlackBox Debug Bar

Immediate feedback on a great majority of errors. Added a conditional red background to the Errors, and with this modification I have never miss even a notice anymore.

Thank you very much!

Essential plugin in my developer toolset

BlackBox is a plugin for plugin and theme developers. It collects and displays useful debug information (errors, executed queries, globals, profiler).

Juliette Reinders Folmer

Debug Bar Shortcodes adds a new panel to the <a href="https://wordpress.org/plugins/debug-bar/" rel="ugc">Debug Bar</a> that displays the registered shortcodes for the current request.
Additionally it will show you:
<ul>
<li>Which function/method is called by the shortcode</li>
<li>Whether the shortcode is used on the current post/page/post type and how (only when on singular)</li>
<li>Any additional information available about the shortcode, such as a description, which parameters it takes, whether or not it is self-closing. 
Want to control the additional information displayed about your own shortcodes ? You can! See the <a href="https://wordpress.org/plugins/debug-bar-shortcodes/faq/" rel="ugc">FAQ</a> for more info.</li>
<li>Find out all pages/posts/etc on which a shortcode is used</li>
</ul>
This plugin is compatible with the <a href="https://wordpress.org/plugins/lrh-shortcode-list/" rel="ugc">LRH-Shortcode list</a> and the <a href="https://wordpress.org/plugins/shortcode-ui/" rel="ugc">Shortcake/Shortcode UI</a> plugins. Additional information about a shortcode provided to these plugins will be taken into account and made available through this plugin too.
<h4>Why is it useful to have insight into the shortcodes ?</h4>
There are a number of typical uses I can think of:
<ul>
<li>
If you are a blog author:
<ul>
<li>to know which shortcodes you can use in your posts/pages.</li>
<li>if you switch plugins or remove a plugin, to know in which posts/pages you need to remove/replace old shortcodes</li>
</ul>
</li>
<li>
If you are a web designer / web master:
<ul>
<li>if you switch plugins or remove a plugin, to know in which posts/pages you need to remove/replace old shortcodes.</li>
<li>to know which shortcodes you can use in theme files.</li>
<li>to avoid name conflicts for website specific shortcodes.</li>
</ul>
</li>
<li>
If you are a developer:
<ul>
<li>to avoid name conflicts with shortcodes registered by other plugins/themes.</li>
<li>to check whether your shortcode registers properly and whether the conditionals are applied correctly.</li>
</ul>
</li>
</ul>
<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.
<h4>Credits</h4>
<ul>
<li>The additional information functionality is inspired by <a href="https://wordpress.org/plugins/lrh-shortcode-list/" rel="ugc">LRH-Shortcode list</a> and <a href="https://wordpress.org/plugins/shortcode-reference/" rel="ugc">Shortcode reference</a>.</li>
<li>The finding of shortcode uses throughout the site is inspired by <a href="https://wordpress.org/plugins/tr-all-shortcodes/" rel="ugc">TR All Shortcodes</a></li>
</ul>
If you like this plugin, please <a href="https://wordpress.org/support/view/plugin-reviews/debug-bar-shortcodes" 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-shortcodes" rel="ugc">Support Forum</a> or in the <a href="https://github.com/jrfnl/Debug-Bar-Shortcodes/issues" rel="nofollow ugc">GitHub repository</a>.

Debug Bar Shortcodes

Works great

Debug Bar Shortcodes adds a new panel to the Debug Bar that displays the registered shortcodes for the current request.

BlackBox Debug Bar vs Debug Bar Shortcodes