phpGroupWare is a collection of PHP coded modules that has ACL system (Access Control List) to keep track of user's tasks and reports. It can contain addressbook, mailing system, calendar script, user accounts, payment reports, inventory and invoice system, planner, to-do list, timesheet and supports more features you want to include into your environment. API source supports several database servers, Modular re-design and a smarty template system. phpgw allows web based framework for managing end user systems.