Commercial Open Source Software
Commercial Open Source Software (COSS) often contains elements of Free Open Source Software, however limits availability of some generally enhanced functionality to closed proprietary software, thereby creating a potential path to the same old vendor lock-in, and so is not "free" and does not qualify as FOSS as a whole. Please only document COSS on this page.
FOSS can be sold and is, for example with support agreements including rapid response, or with service contracts to match configuration to an organization's process workflow, and remain FOSS, as long as the source code is made available as per the terms of their licenses. Indeed, the primary product of RedHat, the most commercially successful open source company ever, remains a distribution of the FOSS operating system Linux.
Some COSS software applications are listed below. To include software on the list below a link must be provided to a page describing elements of closed software, i.e. unreleased proprietary code, with or without fees.
- Kolab - "These are collateral results of the following commercial activities: Uptodate, tested and supported packages for specific distributions can be ordered from the Kolab Konsortium."