An operating system (OS) is a software program that manages the hardware and software resources of a computer. The OS performs basic tasks, such as controlling and allocating memory, prioritizing the processing of instructions, controlling input and output devices, facilitating networking, and managing files.
The main advantages of an operating system include:
Language OS Hybrids :: Languages
Extensible :: Operating Systems
Object Oriented :: Operating Systems
Submicrokernel :: Operating Systems

FunOS - Mostly functional (programming) OS in design, and fun to do system programming in; all policy code in kernel to be in Scheme. To support multiple APIs, and be runtime extensible: replace parts of system on the fly and, within security constraints, by ordinary users.
Lisp-based OSes - History, considerations for operation, list of projects with links (some updated, some not).
LispOS Info Page - Brief history, and link to mail list archive, begun April 1997, closed February 1999, by Richard Coleman (of ZSH), to coordinate efforts to make a free OS to return to users the power of Lisp Machines.
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NASOS: Not Another Scheme Operating System - Ideas, wish list on how to build Scheme OS to run on cheap PC hardware, and some platforms that may succeed it. Intended to be mildly radical yet doable.
Thoughts-on-a-LispOS - Brief description, with careful wish list outline; wiki.
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