[ubuntu] Business Management Software Recommendation

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http://ubuntuforums.org – I'm looking for a business management system that I can host on Ubuntu Server. We are looking for something similar to SharePoint. I need it to be web based and have the ability to share and collaborate on documents. I know there are a ton of solutions out there that can handle that. But... Most importantly I need it to be able to deal with forms. Users should be able to fill out forms and the data from the form gets routed through an appropriate workflow until approval is received (or whatever the end result might be). It would also be nice if the workflow could receive its data from web s (Hardware)