freelancerKit Many happy customers! Only $117 for lifetime license/upgrades. Version 1.38 is the latest release! Try the Demo PHP Project Management A simple to use feature packed PHP Project Management Script. Also known as "PHP Groupware" which includes -- Project Collaboration, Project Management, File Sharing, Note Taking, and User Management (Clients/Employees/Admins). With freelancerKit you can manage all your projects by setting up your clients to share files, set pricing, track progress, set priorities, discuss changes, and much more!
Project Collaboration not bad, well right now I'm still sticking to freelance writing for I had enjoyed writing a lot.