VirtualBox is a general-purpose full virtualizer for x86 hardware, targeted at server, desktop and embedded use.

Vagrant is a tool for building complete development environments using virtual machines. With an easy-to-use workflow and focus on automation, Vagrant lowers development environment setup time, increases development/production parity, and makes the "works on my machine" excuse a relic of the past.

Oracle VM VirtualBox is a general-purpose full virtualizer for hardware. Targeted at server, desktop and embedded use, Oracle VM VirtualBox is now the only professional-quality virtualization solution that is also Open Source Software.