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BRiX: Advanced Computing Environment
Fast, no-kernel, single address space, data-centric, preemptive multithreaded, persistent, secure, multi-user operating system, with Crush function-based programming safe-language. Some code available. [Open Source, Artistic]

BRiX: SourceForge
Fast, single privilege, single address space, preemptive multithreaded, persistent, data-centric, secure, multiuser OS, with safe language, reconfigurable graphical interface.

Choices Object-Oriented Operating System
Research OS coded in C++, architecture organized as frameworks of objects hierarchically classed by function, performance; customized by replacing subframeworks, objects; application interface is kernel objects exported via application/kernel protection layer; kernel and application objects examined via application browsers; runs on bare hardware on distributed and parallel computers. Virtual Choices (VChoices) also runs under Unix System V.

SPIN
Dynamically extensible, Exokernel-based, provides many core services: scheduler, kernel threads, domains, event dispatcher, security mechanisms, primitive VM operations. Blurs distinction between kernels and applications, which traditionally live in user-level address spaces, separated from kernel resources and services by an expensive protection boundary. Lets applications specialize the kernel by dynamically linking new code into running systems.

Crush/BRiX: An Experimental Language/OS Pair
The usual variety of lively opinions, some of which are informed by study and quite insightful and useful in further understanding BRiX. [Slashdot] (August 18, 2002)

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