VirtualBox is a full x86 hardware virtualizer, suitable for server, desktop and embedded usage. It's extremely feature-rich, emulates lots of individual and alternative hardware and devices, supports different virtual machine disk formats, it's cross-platform and supports ancient and current Windows versions, DOS systems, BSD, Solaris and OS/2 as guest operating system.
minor feature: GUI: several layout and mouse position handling with soft keyboard GUI: crash on last VM removed. GUI and API: Allow renaming VMs which are in saved state. Serial: slow guest output when using the TCP server mode without anyone being connected. Guest Additions: Restored 'VBoxClient--checkhostversion' functionality. Guest Additions: resizing and multi monitor handling for X11 guests.. Guest Additions: Build problems with Oracle Linux 8.2 (Red Hat compatible kernel) / Red Hat Enterprise Linux 8.2 / CentOS 8.2. Guest Control/VBoxManage: handling of multiple environment variables supplied to 'VBoxManage guestcontrol VM run'. Guest Control: Implemented support for long(er) command lines. Guest Control: Various stability improvements.