Peter Westwood

Makes that admin bar always visible even for logged out users
Adds a login button when logged out, registration button if registration is enabeld and the shortlink also displays when available.

Logged Out Admin Bar

Makes that admin bar always visible even for logged out users

Marcel Bootsman

Auto Hide Admin Bar makes the WordPress Toolbar disappear – and reappear when hovering the mouse pointer over the top of the browser window. 
You end up with a clean view of your site, and keep having access to the WordPress Toolbar. 
If you have any comments or questions, please use the <a href="https://wordpress.org/support/plugin/auto-hide-admin-bar" rel="ugc">support forum</a>.

Auto Hide Admin Bar

This plugin adds an auto-hide feature to the WordPress Admin Bar or Toolbar.

Logged Out Admin Bar vs Auto Hide Admin Bar