SourceForge - The Complete Open-Source and Business Software Platform.
Microsoft Project - Microsoft Office Project gives you robust project management tools with the right blend of...
openDesktop.org - The website openDesktop.
GanttProject - Project scheduling and management tool
OSOR - OSOR is the Open Source Observatory, a project to provide a framework for developing and executing autonomous observations.
Smartsheet - Smartsheet is an intuitive online project management tool enabling teams to increase productivity using cloud, collaboration, & mobile technologies.