GanttProject - Project scheduling and management tool
QuickChart - QuickChart is easy to use and open-source open API that makes it easy to generate chart images.
Microsoft Project - Microsoft Office Project gives you robust project management tools with the right blend of...
Google Charts - Interactive charts for browsers and mobile devices.
Smartsheet - Smartsheet is an intuitive online project management tool enabling teams to increase productivity using cloud, collaboration, & mobile technologies.
Image Charts - No more pain rendering charts server-side.