Gantter is a web-based project planning and management application. With Gantter you can do similar things you do in Microsoft Project such as: plan your project, review your plan using Gantt chart, manage project resources and calendars, review critical tasks, estimate project cost, control your project progress. You can download in XML or forMS Project. You would probably not want to do a huge plan as there is no account so if you did not download it then you would lose it but ideal for a SME or small  project.