open source

Open source is a set of principles and practices that promote access to the design and production of goods and knowledge. The term is most commonly applied to the source code of software that is available to the general public with relaxed or non-existent intellectual property restrictions. This allows users to create software content through incremental individual effort or through collaboration.
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Adjective
1. of or relating to or being computer software for which the source code is freely available
(pertainym) source code
(classification) computer science, computing

GTK+ Mozilla 

<philosophy, legal> A method and philosophy for software licensing and distribution designed to encourage use and improvement of software written by volunteers by ensuring that anyone can copy the source code and modify it freely.
The term "open source" is now more widely used than the earlier t