I need to manage a open source tool which can manage design documents like class diagram. It should let to merge multiple design documents together and those documents should be in editable format. It's favorable if I can group some documents together like prezzi. When I click on one circle, it will show the high level things. Are there any such open source tools?
Any file format is acceptable. It needs to be shared with other people. others are able to install the same software. Having ability to export as PDF or ODT is preferable