NetOffice is an Open source web based project management and Time tracking tool written in PHP and uses MySQL database backend for database.
It allow you to manage and share information about teams, projects, tasks, deadlines and also allows anyone with an internet connection to enter time and submit it for approval. Approval requests can be routed to managers, project managers, and HR members electronically.
Features include project management tool with team/client collaboration, user management, multiple access levels, tasks, projects, and time tracking, task change history, file approval tracking, notes, client project sites, CRM, Gantt charts and more..
Download : http://sourceforge.net/projects/netoffice/