borantula

Most of the plugins and even standart WordPress tabs in the admin menu are not used very often. 
With this plugin you can make rarely used items in the admin menu invisible until you need them. 
You can just toggle them whenever you need them with Toggle Extra button in the left menu.

Clean WP Admin Menu

Still works!

You can make rarely used items in the admin menu hidden.

Jick

<a href="http://www.jamesdimick.com/creations/olark-for-wordpress/" rel="nofollow ugc">Now Olark for WordPress!</a>

Clean WP Admin Menu vs Hab.la for WordPress