Packer is a tool for building identical machine images for multiple platforms from a single source configuration.
Packer is lightweight, runs on every major operating system, and is highly performant, creating machine images for multiple platforms in parallel. Packer comes out of the box with support for the following platforms:
Amazon EC2 (AMI). Both EBS-backed and instance-store AMIs
DigitalOcean
Docker
Google Compute Engine
OpenStack
Parallels
QEMU. Both KVM and Xen images.
VirtualBox
VMware
Support for other platforms can be added via plugins.
The images that Packer creates can easily be turned into Vagrant boxes.