Volkan Kucukcakar

Show WordPress toolbar (formerly admin bar) with a login button on front end for remembered (previously logged in) browsers. Miscellaneous show/hide/remember toolbar options.
Features: 
* Force display toolbar and adds “Login” button and “Forget Browser (Hide)” buttons to front end on remembered browsers. 
* Remember browser timeout option (cookie expire timeout) 
* Remember user option (user roles support) 
* Options to show or hide toolbar separately for logged in and logged out (but remembered) users. 
* Uninstall option to remove plugin settings on plugin deactivation

Toolbar Login Button

Show Wordpress toolbar (admin bar) with a login button on front end for remembered (previously logged in) browsers. Misc. show/hide/remember options.

Scott Kingsley Clark

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you’d like.
This plugin supports both Per-Site and Per-Network (WordPress Multisite) settings, so you can fine tune your options based on your needs.
Other plugins you might be interested in:
<ul>
<li>Showing the Admin Bar in more cases – <a href="https://wordpress.org/plugins/always-show-admin-bar/" rel="ugc">Always Show Admin Bar plugin</a></li>
<li>Showing the Admin Bar to logged out users – <a href="https://wordpress.org/plugins/logged-out-admin-bar/" rel="ugc">Logged Out Admin Bar plugin</a></li>
<li>Customizing the Admin area based on role – <a href="https://wordpress.org/plugins/adminimize/" rel="ugc">Adminimize</a></li>
</ul>

Admin Bar Disabler

Pretty easy setup.. just install and activate it on the site of your choice (or network activate) and set up the settings however you'd like.

Toolbar Login Button vs Admin Bar Disabler