Open source ssoftware is computer software that is available in source code from the source code and certain other rights normally reserved for copy right holders are provided under a software licence that permits users to study, change, improve and at times also to distribute the software.

open source is a very often developed in a public, collaborative manner. open source software is the most prominent example of open source developed and often compared to technically defined user generated content or (legally defined) open content movement.

Unix is not open source, it is proprietary. Linux is the open-source version of Unix.

Open Source Geospatial Foundation's motto is 'Your Open Source Compass'.

Malcolm X is the power source for the movement of the Sarcomeres. It is from Malcolm X that the movement draws its inspirations and ideals.

"Open-source" means that the source code of a program is available, and may be modified legally. Open-source programs often tend to be free of charge as well, but that's not what "open-source" means.