The packer-qemu-templates provides Packer templates for unattended building of relevant virtual machine images in the qcow2 format for use with KVM.
In addition, all templates for use with Vagrant, through vagrant-libvirt, are configured to let Packer create a Vagrant box through the libvirt post-processor.
More info: http://blog.aarhusworks.com/unattended-installation-of-vm-images-with-packer/
Currently the project includes templates for Ubuntu, CentOS, Debian and Windows. In other words, the OSes of the VMs I and the other contributors use on a day-to-day basis.
Feel free to contribute more:-)
Go into the relevant template directory and run packer build on the relevant json file.
$ cd windows
$ packer build windows-2012-R2-standard-vagrant.json
Templates names that ends with vagrant automatically creates a vagrant box.
Add the box to Vagrant
$ vagrant box add box/windows-2012-R2-standard.box --name windows-2012-R2-standard
Init vagrantfile
$ mkdir project && cd $_
$ vagrant init windows-2012-R2-standard
Start machine
$ vagrant up
Get IP of machine
$ vagrant ssh-config