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Free for small teams of 5 users with an affordable unlimited user package available. The software has been redesigned lately. Tons of project management features for the buck.AceProject.com 
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Smartsheet uses a flexible, spreadsheet-like interface for online project and task management and it also includes sub-tasks, Gantt charts & dependencies, file attachments and discussions on any row, notifications and reminders, and summary reports across projects. Smartsheet offers a free trial and plans starting at $15.95/month.Smartsheet.com
