An example packer configuration for creating a centos 6.6 basebox
You can read more at http://digitalsandwich.com/packer-built-centos-vagrant-base-box-automated-build/
A standard vagrant / puppet configuration I use for new PHP projects
Ruby gem for interacting with the vagrantbox.es api from inside vagrant
My Vagrantfiles for sandbox tests
Build Vagrant baseboxes in vCloud with Packer, for vCloud, VMware and VirtualBox