Software with source code that is available and can be reused and modified by anyone with the appropriate tools and skills. APC believes the use of FLOSS is critical to building an open internet infrastructure. It is committed to creating and experimenting with technology for digital safety and security, and using FLOSS tools, and platforms. Promoting, disseminating, and sharing knowledge about the use of FLOSS is central to its praxis.
Acronyms and synonyms
free/libre open source software, FOSS
Style information
FLOSS written in uppercase
How to use the term
As they do with proprietary software, users must accept the terms of a license when they use open source software—but the legal terms of open source licenses differ dramatically from those of proprietary licenses. https://opensource.com/resources/what-open-source