What are some alternatives?
When comparing QEMU and Boxes, you can also consider the following products
VirtualBox - VirtualBox is a powerful x86 and AMD64/Intel64 virtualization product for enterprise as well as...
VMware Workstation - VMware Workstation is a multiple operating system handler to easily evaluate the any other type of new operating systems.
Parallels - Parallels Desktop is a virtualization software for Mac users to run Windows and Linux apps on OS X.
Workstation Player - Download VMware Workstation Player for free today to run a single virtual machine on a Windows or Linux PC. Organizations use Workstation Player to deliver managed corporate desktops, while students and educators use it for learning and training.
VMware Fusion - Simple and powerful virtual machine for Mac. Mac virtualization software. Learn more about VMware Fusion and try it free today.
TeamViewer - TeamViewer lets you establish a connection to any PC or server within just a few seconds.