obogaf::parser is a perl5 module to parse obo (Open Biological and Biomedical Ontology) and gaf (Gene Annotation File) file. The obogaf::parser reference manual is available at https://metacpan.org/pod/obogaf::parser or by typing on terminal 'perldoc obogaf::parser' (after installing the module). A comprehensive tutorial showing how to install and how to apply obogaf::parser to real bio-medical case studies is available at https://obogaf-parser.readthedocs.io.