Installation archives for some Oberon systems.
Low power application-configurable Operating System
Tool kit for building highly secure special-purpose operating systems
The classic RPL programming language reimplemented and reimagined.
Simplest kernel for cooperative multithreading
Message passing microkernel-based Operating System for ZX Spectrum +3e
LuninuxOS is a Debian/Ubuntu based Linux distribution.
Real time preemptive embedded multi-thread kernel
Run Linux on Windows or other OSes, natively.
Fenix/Free/Fast VDI
64-BIt Operating System with Compiler
Oberon V4 for Linux and sources for different Oberon V4 implementation
Updated Ubuntu Mate OS 64bit (15.10 based)
My own operating system.