Free software, as defined by the Free Software Foundation, is software which can be used, copied, studied, modified and redistributed without restriction. Freedom from such restrictions is central to the concept of "free software", such that the opposite of free software is proprietary software, and not software which is sold for profit, such as commercial software. Free software may sometimes be known as libre software, FOSS, or open source software.

See Wikipedia for information on the usage and history of the term "free software", details of free software licenses, and the Social significance of free software. Wikipedia also explains the motivations behind free software and documents the controversies surrounding it.

Open source software is defined as software that has its source code published as under an open source license which allows others to study, change, and improve the design of that software. See Wikipedia for definitions and terminology, and a description of the Open source model, movement, and licenses.

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