HelenOS 0.5.0 has been released, which is a micro-kernel multi-server open-source operating system.
HelenOS 0.5.0 represents improvements made to this open-source operating system since March of 2011. Some of the key improvements to this original operating system are USB support (USB v1.1). a re-implemented networking stack with full TCP support, Realtek RTL8139 / Intel E1000 network drivers, read-only EXT2 and ISO9660 file-system support, read-write MINIX FS support, and some new ported applications. The ported applications to HelenOS include GNU Binutils, PCC (Portable C Compiler), and MSIM (MIPS R4000 simulator).
Some other highlights of HelenOS 0.5.0 include uni-processor support for IA64, reviving the PowerPC 32-bit support, memory servation support in the kernel, a new Serial ATA driver for QEMU, FAT file-system improvements, and GRUB2 is being used for booting IA32 and AMD64 kernels.
More details on HelenOS 0.5.0 can be found from the announcement page
and release notes
. HelenOS 0.5.0 is freely available here
for AMD64, ARM32, IA32, IA64, MIPS32, PowerPC32, and SPARC64 architectures.