HelenOS

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The HelenOS project aims to develop a general-purpose and portable operating system with elements of microkernel design and fully preemptive kernel. It currently runs on X86 64, IA32, IA64, MIPS, PowerPC (32-bit only) and sparc64 architectures. Incomplete ports to 64-bit PowerPC and the Xen hypervisor paravirtualization environment on IA32. HelenOS itself is licensed under BSD license, some third party components are available under GPL. It provides a general-purpose operating system with all the facilities expected of a modern kernel, including multithreading and symmetric multiprocessing.