Open source describes practices in production and development that promote access to the end product's sources. Some consider it as a philosophy, and others consider it as a pragmatic methodology. Before open source became widely adopted, developers and producers used a variety of phrases to describe the concept; the term open source gained popularity with the rise of the Internet and its enabling of diverse production models, communication paths, and interactive communities.The complexity of such communication relates to Brooks' law, and it is also described by Eric S. Raymond, "Brooks predicts that as your number of programmers N rises, work performed scales as N but complexity and vulnerability to bugs rises as N-squared. N-squared tracks the number of communications paths (and potential code interfaces) between developers' code bases." -- "The Revenge of the Hackers". 2000. Subsequently, open source software became the most prominent face of open source.
The open source model can allow for the concurrent use of different agendas and approaches in production, in contrast with more centralized models of development such as those typically used in commercial software companies.Raymond, Eric S. The Cathedral and the Bazaar. ed 3.0. 2000.
Education :: Operating Systems
Plan 9 Distributed
Open Source :: Operating Systems

ACM Crossroads: Operating Freely - Description of the 3 major, freely available, Unix-like operating systems: Linux, FreeBSD, NetBSD. Crossroads is the student magazine of the ACM.
COTSE-Mini UNIX Distributions - Links to 2 dozen mini Unix distributions: mostly Linux, also FreeBSD, SCO, Solaris MINIX, MINIX.
Meta Description: [ The Computer Professionals' Reference - specializing in computer security and education ]
Linux and BSD, Open Source Giants - Succinct, clear, non-technical introduction to Linux and BSD, focus: how they are relevant to business.
Open Source Unix and Related Software Projects - Small page of logos and links to resources, distribution channels for the most popular, freely distributable Unix, and a few other projects. FREENIX links in English, Français, Norsk.
Meta Description: [ A complete resource for information, reviews, books and distribution channels for Open Source UNIX and related software projects. ]
PIOS: Pleasant Interactive Operating System - Free Unix clone developed by PIE Software Inc., for x86 PC compatibles, to give a stable multi-user high security platform for use as a network server, programming work-horse, or desktop system; designed so even complex tasks are easy.
Meta Description: [ Home Page Of PIE Software Inc, Home Page Of PIE Software Inc ]
Thix - Unix kernel written in 1994-95; almost full implementation of POSIX.1 standard, IEEE Std 1003.1-1988. Goal: mainly to learn OS design, architecture, kernel algorithms, resource allocation, process scheduling, and memory management; free software has been compiled for it. [Open Source, GPL]
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