Ontology related tools from other sources

Ontology Editors and Plug-ins
EDITOR: OBO-Edit
Graph-based editor for OBO ontologies
PLUG-IN: OWL Converter
Plug-in for OBO edit to convert OBO format into OWL files
PLUG-IN: GoPubMed
Ontology Generation Plug-in for OBO-Edit 2
EDITOR: BioSphere
A Bio-Ontology Portal. Collaborative development of ontologies for biology