Greenweb

Only use this plugin if you already have Ozh’s Admin Drop Down Menu installed.
Ozh’s Admin Drop Down Menu is a great ui option 
But it should be an option that does not effect every author, editor and admin on a website
If you like this plug-in please give it a five star rating, blog about it, Tweet about it and tell your WordPress friends.

Hide Option for Ozh's Admin Drop Down Menu

Gives your users the ability to turn off Ozh's Admin Drop Down Menu in their profile

yonisink

Create a WordPress menu (up to three levels) with the WP appearances built-in menu builder and convert it to a nice responsive dropdown using template tags.
Choose your colors, and whether you want a hover or click (click will be permanent on responsive break due to mobile devices’ use of hover as a “pre-click”).

Sinking Dropdowns WordPress

Convert default WordPress menu to a responsive hover/click dropdown menu.

Hide Option for Ozh's Admin Drop Down Menu vs Sinking Dropdowns WordPress