What are some alternatives?
When comparing GNOME Planner and Smartsheet, you can also consider the following products
Microsoft Project - Microsoft Office Project gives you robust project management tools with the right blend of...
Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.
GanttProject - Project scheduling and management tool
Wrike - Wrike is a flexible, scalable, and easy-to-use collaborative work management software that helps high-performance teams organize and accomplish their work. Try it now.
LibrePlan - LibrePlan is an open source web application for project planning, monitoring and control.
Basecamp - A simple and elegant project management system.