That's usually said as Open Source Software (OSS) or longer acronyms that sound like dental care.

FLOSS, FOSS, OSS, OS, dear child has many names :)

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> or longer acronyms that sound like dental care.

What acronym are you thinking of?

They're referencing "FLOSS": Free/Libre and Open Source Software [0]

[0]: https://www.gnu.org/philosophy/floss-and-foss.en.html