Melissa Cabral

A simple, lightweight plugin that displays useful technical information on pages and posts to aid in developing WordPress Classic themes. Provides quick access to things that are sometimes hidden, like post/page ID, slug, taxonomy terms, and post type slug. Theme Inspector tells you exactly what conditional tags are true on each view, and what template file loaded on each page view.
<ul>
<li>Use In Conjunction with the <a href="https://docs.google.com/drawings/d/1hJ0MpHO3HKBT5KsTpGtc_gDYZ5pi-HyxNcRtmPBBULE" rel="nofollow ugc">WP Template Hierarchy Document</a>.</li>
<li>Theme Inspector is only visible to logged in Administrators.</li>
<li>Appears on the right-side of the Toolbar (admin bar).</li>
</ul>

Theme Inspector

A developer's inspector to illuminate the WordPress Template Hierarchy and help with building WordPress Classic themes.

KamataRyo

<a href="https://github.com/KamataRyo/inherit-theme-mods" rel="nofollow ugc">This plugin is hosted on github.</a>
Inherit Theme Mods enables to copy customizer properties from parent theme to child.
Do you still need customizer properties of parent theme when you decorating new websites with child theme? 
‘Inherit Theme Mods’ can solve it. 
This plugin simply copies and inherit, or overwrite parental properties to its child. 
Also it works as an inspector of customizer properties.
<h3>Required</h3>
<ul>
<li>tested on PHP5.3 and PHP5.6</li>
<li>tested on WordPress3.9.12 and WordPress4.5.2</li>
</ul>

Inherit Theme Mods

'Inherit Theme Mods' enables to copy customizer properties from parent theme to child.

Theme Inspector vs Inherit Theme Mods