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.

zxial

This plugin provides JSON data to mobile APPs. Here’s the scenarios that you 
could use this plugin: you want to develop a mobile app or app on mac, and the 
app is to show the list of your blogs(in category, tag, or keywords), after 
the app user click one item in the blog list, you would like to show him the 
detail page of the item, but the logos/banners/sidebar of blog is suitable 
only for a desktop other than a mobile device or you want to do something 
different. In the case here, wp_app_json mayble could help.
Code: 
Author: Zxial 
Web: http://zxial.me

WP APP JSON

The WP-APP-JSON is a plugin that provide json data to mobile apps, you can use keywords to search your posts and get detail webpage.

Clean WP Admin Menu vs WP APP JSON