edutagger is a social bookmarking service for K-12 learners and educators, allowing you to store your web links online and share them with others, all within an educational context.
A. Hotho, R. Jäschke, C. Schmitz, и G. Stumme. Proceedings of the Conceptual Structure Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, стр. 87-102. (2006)