This document summarizes a presentation about using free and open source software (FOSS) in geoscience. The presentation will take place at the EGU conference on Tuesday at 17:30 in room SM6. The presenters will discuss how scientists use and contribute to FOSS tools to conduct research, communicate findings, and extend existing tools for new applications. They will also discuss ideas to better recognize and support the role of FOSS in scientific work, such as establishing a FOSSIS session at EGU to highlight technical FOSS solutions or awarding a prize for innovative FOSS use. Attendees will be invited to introduce themselves and their fields of science and FOSS tools.