Comparison of free project management tools

I have played with a few free project management tools and here is a first summary. I am not an expert of PM...

• OpenProj
• Easy to use
• PERT and Gantt diagram
• PERT diagram is a bit difficult to read
• Collabtive
• Quite complex to install
• No PERT diagram
• No Gantt diagram unless you pay
• Good UI
• redmine
• Quite easy to install
• Gantt diagram
• No PERT diagram
• Planner
• Easy to use
• Provides only Gantt diagram
• No PERT diagram
• GanttProject
• Easy to use
• PERT and Gantt diagrams
• Does not provide subtasks