This list provides a quick overview of the landscape of open-source bibliographic software; both where is has been, but more importantly, where it may yet go.
A. Hotho, R. Jäschke, C. Schmitz, and G. Stumme. Proceedings of the Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, page 87-102. Aalborg University Press, (February 2006)