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The HelenOS project is an effort to develop a complete and usable modern operating system, yet offering room for experimenting and research. HelenOS uses its own microkernel written from scratch and supports SMP, multitasking and multithreading on both 32-bit and 64-bit, little-endian and big-endian processor architectures, among wich are AMD64/EM64T (x86-64), ARM, IA-32, IA-64 (Itanium), 32-bit MIPS, 32-bit PowerPC, SPARC V9 and Xen 3.0. Thanks to the relatively high number of supported architectures and suitable design, HelenOS is extremely-well portable."
Member since:
2005-07-06
According to:
http://en.wikipedia.org/wiki/Plan_9_from_Bell_Labs
Its opensource and released under the Lucent OpenSource Licence.
As for its lack there of success, it really hasn't marketed itself, its hardware support is lacking, and the availability of software is also lacking.
Edited 2007-08-16 21:01