Auxrames is a Web-based PHP tool that allows human resources management. It is designed to manage a team with lot of tasks. You can see holidays (yellow), non-working time (purple), and tasks (green, depending on the workload percents). You can perform user management, import users from your LDAP and possibly AD, and set different groups. Each of your team members can be allocated to one or more groups. You can decide to always display a user even if he has no tasks, so as not to forget him.