For those into the Haiku operating system, an open-source re-make of BeOS, the fourth alpha of its first release is now available. It's been nearly one and a half years since the Haiku Release 1 Alpha 3, so there's a lot of changes with this latest installment.
Aside from fixing more than one thousand bugs with this latest alpha release, new features include a native debugger application, the BFS file-system is more robust, the NTFS file-system is improved, improved USB OHCI drivers, a new 10-band equalizer, improved network card drivers, early IPv6 support, an updated Mesa stack, improved virtual memory settings, support for most Radeon HD GPUs, improved wireless drivers, WPA/WPA2 support, and there's even better Blu-ray disc support for this BeOS operating system.
More information on Haiku Release 1 Alpha 4 can be found from the release announcement
and Haiku release notes