Need to show a content block to only your site’s authors? Or maybe just to admins only? The User Roles add-on for Content Visbility allows you to do just that!
Every block on your site (including widgets) can be shown or hidden to users who have any role (or roles).
Custom Roles
This add-on supports any custom role that your theme or plugins have registered, as well as the native WordPress roles.
Development
Development is mostly done on github and releases are made there and here to the WordPress plugins directory.