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Line 4: Most of the current BSD operating systems are [[Open-source software\|open source]] and available for download, free of charge, under the [[BSD License]]. They also generally use a [[monolithic kernel]] architecture, apart from DragonFly BSD which feature [[hybrid kernel]]s. The various open source BSD projects generally develop the kernel and [[user space\|userland]] programs and libraries together, the source code being managed using a single central source repository. ~~In the past,~~ BSD ~~was~~has also been used as a basis for several proprietary versions of UNIX, such as [[Apple Inc.]]'s [[MacOS]], [[Sun Microsystems\|Sun]]'s [[SunOS]], [[Sequent Computer Systems\|Sequent]]'s [[Dynix]], [[NeXT]]'s [[NeXTSTEP]], [[Digital Equipment Corporation\|DEC]]'s [[Ultrix]] and OSF/1 AXP (which became the now discontinued [[Tru64 UNIX]]). ==Aims and philosophies==

Comparison of BSD operating systems: Difference between revisions