free, open-source software

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"free, open-source software" is software which is not only free (as in either "costing nothing to obtain legally" or as in "free for additional copying and modifying", depending on who you talk to) but also open source (meaning that the source code is available for modification and re-distribution).

"Costing nothing to obtain legally" is sometimes referred to as "free as in beer", and "free for additional copying and modifying" is often referred to as "free as in speech" or "libre".

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Related Pages


  • Open Source Versus: comparisons of open-source and proprietary software
  • Essay by Tom Chance about the philosophical differences between "free", "open source", and "proprietary" software development