This web site lists free and open source project management tools and task management software that can be used to manage software development projects. Project management tools are often specialized according to a specific project management approach: traditional (Waterfall), Agile, Scrum, Kanban, Lean, etc. The traditional project management approach is supported by the Project Management Institute (PMI) that proposes the Project Management Professional (PMP) and CAPM certifications. This approach uses sequential phases of different activities to deliver software. The features provided by traditional open source project management tools are the Work Breakdown Structure (WBS), the Gantt and PERT charts to describe the sequences of tasks, find the critical path, resource allocation graphs, mind maps and risk management. Some allows also to do some time tracking and document sharing.