TempleOS is a non-preemptive and multi-tasking PC operating system that is open-source and free. It operates on x86_64, is non-networked, and employs a single-address map with no paging. Also, it runs solely on ring-0 and uses multiple cores.

The software comes with a 64-bit compiler, assembler, unassembler, boot loaders, games, utilities, and tools. Additionally, users have access to a graphics library that supports VGA, keyboard, mouse, CD/DVD, and hard drives. Although it is recommended to run TempleOS in VMware, VirtualBox or QEMU, some 64-bit machines from 2004-2011 can support its native operation.
In conclusion, TempleOS is an operating system that is ideal for non-networked environments. It offers a range of features and tools that simplify software development and enable users to work in a secure, single-address-map environment. TempleOS is an excellent choice for those seeking a free public domain operating system.
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