ChorusOS is a microkernel real-time operating system designed for embedded systems. Sun Microsystems acquired Chorus Systems, the company which created ChorusOS, in 1997. Sun no longer supports ChorusOS. The founders of Chorus Systems started a new company called Jaluna in August 2002. Jaluna designs embedded systems using Linux and ChorusOS (which they dub "C5").
ChorusOS started as the Chorus distributed real-time operating system at INRIA in the 1980s. Over the time, development effort shifted away from distribution aspects to real-time and modularization (componentization).
The latest source tree of ChorusOS has been open-sourced by Sun on experimentalstuff.com. Jaluna has completed these sources and made available a complete runnable system on sf.net/projects/jaluna.
More on [ ChorusOS ]
Open Source :: Microkernel
Open Source :: Operating Systems
Open Source :: POSIX

ChorusOS - Very brief feature list; by CNET/ZDNet Enterprise Business, Tech Update.
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ChorusOS Open Source - Microkernel OS used in realtime and embedded environments. Sun Microsystems open sourced it, with 4 licenses: Sun Public License Lite, GPL, Mozilla, FreeBSD. Description, download. [ExperimentalStuff.com]
Micro Kernel Reference: ChorusOS - Brief, dense technical summary of Sun Microsystems ChorusOS.
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Sun Announces ChorusOS 4.0 Software - Cornerstone for new embedded telecom platform; combines power of Solaris with realtime performance of ChorusOS.
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Sun Microsystems, Inc. - Makes ChorusOS: highly scalable, reliable, POSIX compliant, embedded, realtime operating system; used by top telecom suppliers, in: public switches, PBXs, access networks, cross-connect switches, voice-mail systems, cellular base stations, cell-phones, web phones.