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Re:Homebrew removes MongoDB from core formulas by blauekapelle on Tuesday September 03, 2019 @05:50AM (#20865044)
Open source: source is freely available online.

Free software: free for modification, expansion or forking. Possibly free for profit (BSD license)

Source Available: Source is available but under restrictions. Locked room source viewing under NDA to confirm there aren't vulnerabilities for example.

Re:Homebrew removes MongoDB from core formulas by StavrosK on Tuesday September 03, 2019 @06:03AM (#20865103)
Open source/free software: You can download, modify and re-release the source.

Source-available: You can view the source, perhaps freely, but can't modify or release your modifications.