Neptune OS is a Windows NT-like operating system built on the seL4 microkernel that can run unmodified Linux and Windows kernel drivers as unprivileged userspace processes. The project realizes the original NT vision of a microkernel architecture with system services and drivers isolated in user mode, improving stability and security compared to monolithic kernels.
Commodore's Amiga Unix, a historically underdog operating system, is experiencing a modern revival after years of obscurity. The project represents renewed interest in preserving and updating legacy computing platforms for contemporary use.
A software developer spent a summer experimenting with FreeBSD and other BSD operating systems out of curiosity about Unix-based systems, ultimately discovering the practical advantages of BSD's design philosophy and discovering that many devices like PlayStation and macOS already use BSD-derived kernels.