Collabtive – A Free Open Source Project Management Software

MakeUseOf: "Managing projects can be tricky, time-consuming and confusing. It’s easy to lose one’s way when faced by a myriad of tasks, each with its own deadline. Project management requires a manager to be alert at all times. It is, in essence, the art and science of managing everything that is related to a project (be it tasks, team members, deadlines, etc.). When all aspects of a project mesh together without causing any disruptions, we have what we call a successful project."