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Copyfree Works

The license status of some works may be more complex than it at first appears here. In some cases, the license status listed for a given work is the "primary" license under which it is distributed. In several cases, parts of the work may be distributed under other licenses -- potentially even non-copyfree licenses.

Where present, descriptions are typically drawn from the claims of the projects themselves, and represent neither claims nor opinions of the Copyfree Initiative. Inclusion here (with or without description) does not constitute, and should not be inferred as, endorsement of any project.

Listings are presented for informational purposes only, and no representation is made as to the accuracy or utility of any information provided. Use at your own risk.

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AerieBSDpermalink

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AtomOSpermalink

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AtomOS is a multitasking monolithic kernel based, x86 targetting, operating system written in C#, from scratch, aiming for security and high level implementation of drivers in a managed environment.

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Bitrigpermalink

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Bitrig is a free, fast, and secure Unix-like Open Source operating system based on OpenBSD.

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Contikipermalink

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DesktopBSDpermalink

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DragonFly BSDpermalink

DragonFly BSD is a BSD Unix OS with a number of differentiating features like advanced parallelization capabilities, the HAMMER filesystem, and virtual kernels, among others. The development community takes its own approach to system development where it makes sense to meet the project's goals, and maintains strong FreeBSD compatibility where it doesn't.

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FreeBSDpermalink

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FuguItapermalink

FuguIta is a "live system" that boots from removable media, based on OpenBSD.

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gokrazypermalink

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With gokrazy, you get a pure-Go userland on top of the Linux kernel for your Raspberry Pi appliances.

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Mezzanopermalink

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Mezzano is an operating system written in Common Lisp.

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Minix 3permalink

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MirageOSpermalink

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MirageOS is a library operating system that constructs unikernels for secure, high-performance network applications across a variety of cloud computing and mobile platforms.

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MirOSpermalink

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NetBSDpermalink

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nuttXpermalink

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NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 32-bit microcontroller environments, the primary governing standards in NuttX are Posix and ANSI standards. Additional standard APIs from Unix and other common RTOS's (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).

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OpenBSDpermalink

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PC-BSDpermalink

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Redoxpermalink

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Redox is a Unix-like Operating System written in Rust, aiming to bring the innovations of Rust to a modern microkernel and full set of applications.

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ROSpermalink

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Zeropermalink

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