Lee Willis

Always shows the admin bar if the user has previously logged in to the site. 
Non logged in users will see the bar in the normal place, complete with a login link.
Note: This plugin is no longer supported. The plugin is available for forking and contribution over on <a href="https://github.com/ademti-software/always-show-admin-bar/" rel="nofollow ugc">GitHub</a>.

Always Show Admin Bar

I had to debug a website and the premium theme was hidding the admin bar which I wanted to use for Debug Bar and Theme Template Debugger.

This plugin solve this issue !

Very useful !

Always shows the admin bar if the user has previously logged in to the site.

Dojo Digital

This plugin adds a textarea to the Customize page that allows theme editors to write, preview, and implement CSS code in real time. 
It also includes a frontend CSS editor window with live preview capability.

Live CSS Preview

Live front-end and Customizer CSS editing powered by native WordPress Additional CSS storage.

Always Show Admin Bar vs Live CSS Preview