HelenOS is a modern microkernel-based multiserver operating system running on a large variety of processor architectures. Version 0.4.3 thereof has been just released. The new release fixes many bugs and brings a lot of improvements in areas so diverse such as new hardware platform support, userspace device driver framework, device drivers, observability and robustness, programming languages, file systems and networking. For the complete list of user-visible changes, see the release notes. The released files can be downloaded from the project’s download page.