RightField is an open-source tool for adding ontology term selection to Excel spreadsheets. RightField is used by a 'Template Creator' to create semantically aware Excel spreadsheet templates. The Excel templates are then reused by Scientists to collect and annotate their data; without any need to understand, or even be aware of, RightField or the ontologies used. Later, the information selected or completed by the Scientist can be extracted from the spreadsheet along with all term or ontology information, or as RDF