Product addons let you offer additional items for sale alongside a specific parent product but bill for them on a separate billing cycle.
Sitejet Builder includes everything that your customers need to create professional websites without needing to learn to code.
Support tickets provide an easy way to handle one-on-one communications with your clients using WHMCS's fully-featured ticket desk.
WHMCS's automation can perform many actions to help you handle tickets. You can add scheduled actions to individual support tickets, configure escalation rules for support departments, or automate closures for inactive tickets.
WHMCS Connect uses single sign-on to access all of your cPanel & WHM servers in WHMCS without the need to reauthenticate each time.
Admins have access to a personal calendar, to-do list, and notepad.
WHMCS allows you to ban specific email domains from creating new client accounts and users. You may wish to ban free email providers.