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.
Project Estimate Tracker (PET) from shadowfax.org.uk is designed to allow teams to track progress and time spent on projects. It allows team members to set up new Projects and Tasks and record estimates of task completion. As the project moves on, completion estimates may be revised to reflect changes, delays, etc. It also contains a time-sheet component that allows team members to record time spent against tasks.