OpenCyc is the open source version of the Cyc technology, the world's largest and most complete general knowledge base and commonsense reasoning engine.
The SWRC (Semantic Web for Research Communities) is an ontology for modeling entities of research communities such as persons, organisations, publications (bibliographic metadata) and their relationships. It is used in numerous applications and projects including the AIFB portal, Bibster and the SemIPort project.
P. Martin. Conceptual Structures: Standards and Practice: 7th International Conference on Conceptual Graphs, 1867, page 41-54. Springer Verlag, (2000)Detailed description of the notational conventions used for knowledge engineering in WebKB-2.
P. Martin, and P. Eklund. Workshop on Virtual Documents, Hypertext and Functionality and the World Wide Web, page 35-40. Technical Report, Department of Computer Science, University of Bolonga, (1999)