Access Manager enables companies and organizations to control and restrict access to their Knowledge Base using built-in WordPress roles (Subscriber, Author, Editor).
Add-ons provide additional access control and features:
Custom Roles add-on let you map custom WP Roles to KB Roles. Used together with KB Groups add-on you can map WP Roles against KB Groups and Roles.
KB Groups add-on organizes users into groups. You can create KB Groups and assign your users to those groups. Each user within his/her group has a specific KB Role (KB Subscriber, KB Author, KB Editor, or KB Manager). If you have Custom Roles add-on then you can also map custom WP Roles to KB Groups and Roles.