I have been following the development of NixOps for some months. NixOps is a cloud deployment tool using nix, the functional package manager for unix systems. Nix makes it very intuitive to define absolute package dependencies. No more thinking and guessing about required runtime dependencies. NixOps supports deploying to different platforms. Bare-metal, cloud, and even virtual environments like virtualbox work out of the box. I have worked in many projects using vagrant.