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
GNOME Planner is an open-source project management tool best suited for users looking for a free, lightweight solution with essential features, while Smartsheet is a powerful cloud-based platform ideal for collaboration and advanced project tracking, albeit at a cost.