OBO-Edit is an open source, platform-independent application for viewing and editing any OBO format ontologies. OBO-Edit is a graph-based tool; its emphasis on the overall graph structure of an ontology provides a friendly interface for biologists, and makes OBO-Edit excellent for the rapid generation of large ontologies focusing on relationships between relatively simple classes.
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OBO-Edit–an ontology editor for biologists.
Day-Richter J, Harris MA, Haendel M; Gene Ontology OBO-Edit Working Group, Lewis S.
Bioinformatics. 2007 Aug 15;23(16):2198-200. Epub 2007 Jun 1.