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Open source software:

Open-source software (OSS) is computer software that is available in source code form for which the source code and certain other rights normally reserved for copyright holders are provided under a software license that permits users to study, change, and improve the software. Some open source licenses meet the requirements of the Open source definition. Some open source software is available within the public domain. Open source software is very often developed in a public, collaborative manner. Open-source software is the most prominent example of open source development and often compared to (technically defined) user generated or (legally defined) open movement contents movements.

Open source operating system:


Linux refers to the family of Unix-like computer operating system using the Linux kernel. Linux can be installed on a wide variety of computer hardware, ranging from mobile phone, tablet computers and video consoles, to mainframe and supercomputer. Linux is a leading server operating system, and runs the 10 fastest supercomputers in the world.


FreeBSD is an advanced operating system for x86 compatible, amd64 compatible, ARM, IA-64, PowerPC, PC-98 and UltraSPARC® architectures. It is derived from BSD, the version of UNIX® developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.


is developed entirely by volunteers. The project pays for the development environment and developer events by selling CDs through a collection of stores and by accepting donations from organizations and individuals. These finances ensure that OpenBSD will continue to exist, and will remain free for everyone to use and reuse as they see fit. T.shirt and posters are available as well, but do not fund the project.


NetBSD is a freely available open source version of the Unix-derivative Berkeley Software Distribution (BSD) computer operating system. It was the second open source BSD descendant to be formally released, after 386BSD, and continues to be actively developed. The NetBSD project is primarily focused on high quality design, stability and performance of the system. Due to convenient license and portability, NetBSD is often used in embedded systems.


OpenSolaris was an open source computer operating system based on Solaris created by Sun Microsystems, now a part of Oracle Corporation. It was also the name of the project initiated by Sun to build a developer and user community around the software. After the acquisition of Sun Microsystems, Oracle decided to discontinue open development of the core software, and replaced the OpenSolaris distribution model with the commercial Solaris Express.
Prior to Oracle's moving of core development behind closed doors, a group of former OpenSolaris developers decided to "fork" the core software, and development of an OpenSolaris-based core OS continues under a community project called Illumos. The OpenIndiana project, a part of the Illumos Foundation, aims to continue OpenSolaris development and distribution, using Illumos as its core.


MINIX is a Unix-like computer operating system based on a microkernel architecture created by Andrew S. Tanenbaum for educational purposes; MINIX also inspired the creation of the Linux kernel.
MINIX (from "mini-Unix") was first released in 1987, with its complete source code made available to universities for study in courses and research. It has been free and open source software since it was re-licensed under the BSD license in April 2000.