1, The full form of FOSS is Free and Open Source Software. It’s used on Computing ,Sofware & Applications in Worldwide

Free and Open Source Software (FOSS) is software that is both free and open source.

2, The full form of FOSS is Field Operational Support System. It’s used on Governmental ,Standards in Canada

Field Operational Support System (FOSS) is the main operational support for Immigration operation in Canada.

3, The full form of FOSS is Full Option Science System. It’s used on Academic & Science ,Universities & Institutions in United States

Full Option Science System (FOSS) is an elementary school science program developed at the Lawrence Hall of Science, University of California at Berkeley with support from the National Science Foundation.

4, The full form of FOSS is Forum of Small States. It’s used on Associations & Organizations ,International Orgaizations in United Nations

Forum of Small States (FOSS) is a loose non-ideological and non-geographical coalition of small states.