When the term is used as a noun, “open source” is recommended. When it is used as an adjective (a compound modifier), “open-source software” is recommended. The adjective “open-sourced” is not recommended. This usage follows common practice rather than the Oxford English Dictionary. The term “open source” is strictly recommended for free software as defined by The Open Source Initiative (OSI) and reviewed and approved by them.
- open source
open-sourceOpenSource- open-source software
open-source-softwareopen source software