UPDATE March 14, 2018
Repository and tracking officially moved to github. https://github.com/opticks-org/opticks
Sourceforge mailing lists are still in use.
Opticks is an open source remote sensing application and development framework.
The OBO-Annotator is a semantic NLP tool that is designed to give its end-users a great deal of flexibility to combine any number of OBO ontologies from the OBO foundry regardless of their format and use them to annotate text-bases.