Marcus Downing

Adds an “Identifier” column to the All Posts and All Pages admin panels, and to any custom post types. 
This column goes just after the Title column and shows each page’s slug, indented if necessary.

Page Identifier Column

Adds an "Identifier" column showing a post of page's slug, just after the Title column.

chrisnowak

Ever get tired of seeing the same menu options you literally never use? Or setting up a WordPress install for a client, and want to get rid of the stuff they don’t use, or would screw up if they could?
Us too. So we made this handy little plugin that gives you little checkboxes next to each menu item and sub-menu item, even for other plugins! Just uncheck the items you don’t want to see anymore, and they’re gone! When you need them again, just recheck and they’re back! No editing core files, and being over-written upon upgrade.

Simple Admin Menu Editor

Easily and Simply show and hide what is in your admin nav. That's it.

Page Identifier Column vs Simple Admin Menu Editor