The Custom Project Tab module integrates a "Projects" tab into all WHMCS admin client pages, including Summary, Profile, Users, Tickets, and others, using data from the WHMCS Project Management Addon. It displays a list of current projects (not marked as completed) and past projects (marked as completed) for the selected client, with each project’s ID, title, due date, and status shown in separate tables. Clicking a project’s ID or title links directly to its management page in the Project Management Addon. The module allows configuration of which project statuses are considered "completed" via a comma-separated list in the settings. It requires no template edits—just upload and activate in WHMCS’s Addon Modules section.