GNOME Planner is a cross-platform project management tool based on the Work breakdown structure (WBS). Developed by Richard Hult and Mikael Hallendal, Imendio
License: Open Source
Trello is a flexible, visually-oriented task management tool ideal for team collaboration and simple project tracking, while GNOME Planner offers advanced project management features such as Gantt charts and resource allocation, making it better suited for detailed project planning.