VirtualBox implements a virtual USB controller and supports passing through USB 1.1 and USB 2.0 devices to virtual machines. This component implements a complete RDP server on top of the virtual hardware and allows users to connect to a virtual machine remotely using any RDP compatible client. Note that this list may change over time as some of these features will eventually be made available with the open-source version as well. The following list shows the enterprise features that are only present in the closed-source edition. The open source version lacks some features but has to be compiled of tarballs the binaries are the proprietary version which is free to use. If you've installed it via the binary you got all features. I know the personal version is the free one. It's the only one I've tried, and it works great for me. Wow, what features aren't there in VirtualBox.

Vmware has no open source version only the free vmwareplayer and server.

Well the proprietary version is free to use for personal usage.

Qemu vs virtualbox vs dosbox