LoseThos is a 64-bit operating system created from scratch. It is not a Unix. It includes all the tools for programming and some games. It is free and open source.
http://www.losethos.comIt is distinct from other open source operating systems because it's code is exceedingly simple. It is just for x86-64 architecture so it's not complicated by #ifdef's. It also runs everything in ring0, kernel mode, including user programs. This makes it really simple along with it's memory scheme of using physical addresses. It's as simple as a Commodore 64, but multicored and 64-bit. Well, it is multitasking.
