DragonFly BSD has released version 6.4.2 recently. This update fixes a kernel panic bug, fixes VirtIO block device cylinder count reporting, fixes several FDISK issues, and more. DragonFLYBSD is based on FreeBSD. The code is licensed using the BSD license. DragonFlyBSD is focussed on scalability, performance, and modern multi-core/threading support. It uses the RC init system and the HAMMER file system.
The project's official website is here:
The source code can be found here:
https://gitweb.dragonflybsd.org/dragonfly.git
The full release notes for this update can be found here:
https://www.dragonflybsd.org/release64/
If you wish to help the project financially they accept donations through Paypal: