Brian

Hide Plugins is a light-weight plugin that gives a single admin user the ability to hide plugins prevent them from being activated, deactivated, or deleted by clients and other users, including administrators. By activating Hide Plugins, you will be able to see all plugins and a toggle to hide each plugin from other users on the Plugins page. Hide Plugins will always remain hidden.
Note that the dropdown on the Edit Plugins page will not be affected, since it does not have a filter to hook into. Hidden plugins will remain active, so traces of the plugin in areas other than the Plugins page (like options pages in the admin menu) will still be visible. If you also want to hide menus, we recommend using <a href="https://wordpress.org/plugins/admin-menu-editor/" rel="ugc">Admin Menu Editor</a>.

Hide Plugins

Hide installed plugins from clients and other admin users.

michaeltyson

Specify a list of tags or categories to keep hidden: These will no longer appear anywhere 
on the site, such as in the tag cloud or on the list of post tags. This is useful when using 
tags to control behaviour of your blog with other software, or when you wish to maintain 
groupings of posts out of the public eye.

Hidden Tags

Hide certain tags/categories from the public

Hide Plugins vs Hidden Tags