OSS
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Glossary of OSS-related terms
FOSS : Free/Open Source Software
A general term for free software and OSS.
OSS : Open Source Software
Software that publishes and distributes source code. There are various license forms such as commercial non-availability and redistribution prohibition.
Free Software
Software that can be freely modified and distributed, not just so-called free software (free of charge).
How to investigate OSS trends for web development - Qiita
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Open source
OSS