Projectfork. I rarely make a bad review and I did like PF 3.0 a lot more than PF 4.0 due to more flexibility.
I will review PF 4.0 in following title: Permissions: PF 4.0 has been divided to independent subcomponents such as Projects, Milestones, Tasks, etc... Permissions at each subcomponent is defined separately and independently from each other, this is not good especially when it comes to relations of whole project permissions related to other subcomponents (If Registered users have permissions of Create and Edit Own, then if someone creates a Project, then any other Registered user can add Milestones, Tasks and interfere with everything within that project, in other words you can not create a simple Project Management service unless you manually defined details of permissions for every project). Projectfork Powerful & Intuitive Project Management for Joomla! The Thinkery.