Packer
Used #veewee to generate #Vagrant boxes so far. #Packer also looks to be a really interesting tool to generate images for multiple platforms like #VirtualBox, #Docker, #OpenStack, etc. from one source configuration. Also supports several provisioners like #Chef, #Puppet, #Ansible, etc.
Packer is a free and open source tool for creating golden images for multiple platforms from a single source configuration.
