I'd suggest just using a wiki. That gets you version control and formatting and content repository and user identity management. Otherwise you could use Google Drive/Google Docs and manage things as folders.
proposal mgmt system
Want to develop a proposal mgmt system to colloborate and create..what softwares are your choices? the system should serve as a content repositary and provide manage, organize, format and control versions and retain the history of the users. Also to allow the repurposing of the old content whenever it requires. What all the softwares need to be used and approximate timeline to develop a system with a team size of 3?