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BSDStep is an open source BSD based distribution using code from the L4 Microkernel, DragonFly BSD, Cairo and GNUstep projects.
C10 strives to be compatible, innovative, complete and useful,whilst also aiming for modularity and cleanliness.The goal is to provide an integrated system (similar to the BSDs), with binary compatibility with other ABIs/OSes.
The Darwin Source repository is intended to fill a void left by the closure of the OpenDarwin project: providing a permanent and public repository for the open source components of Mac OS X.
Darwin on ARM develops and provides patches for the Apple Darwin-xnu kernel sources so that it can be cross-compiled to run on an ARM processor.
The NeXT IRIX or maybe MacOSX. Eventually to be based on the open-source core of OSX, Darwin. Using the free implementation of OpenSTEP, GNUstep for its desktop and application environment, this WILL be the NeXT multimedia powerhouse.
OpenDarwin.org files (original site is down, currently mirrored at www.opendarwin.info)
This project is derived from the the defunct OpenDarwin project, updated with current sources from Apple where possible, and intended primarily to facilitate easy development of the OS X port of D/ELTA.
Xenu is a open-source/Apple public source project aimed at adding Xen Virtulization to the XNU kernel. Allowing users to run other operating systems and architectures binaries under Mac OS X.
Yarrwin is a fork of Apple's Darwin, created with the intention of simplifying creation of Darwin-based distributions and addition of novel software features to the Darwin platform.