camdagr8

This plugin simply removes all the default WordPress Dashboard Widgets

Dashboard Killer

This plugin simply removes all the default Wordpress Dashboard Widgets

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.

Dashboard Killer vs Hide Plugins