Apache SIS is a toolbox offering some Geographic Information System (GIS) services. SIS is developed as an open source project under Apache 2 license and can be used as a foundation for independent projects. The add-in for OpenOffice or LibreOffice described here is a bridge for accessing some Apache SIS functionalities from Calc spreadsheet. Currently only coordinate operation services are (partially) made accessible, but we hope to open the add-in to more functionalities in the future.