Containerisation tool without daemons in Rust

http://vagga.readthedocs.org/en/latest/vagga_features.html hits the nail on the head. It explains very well why vagga is an interesting option compared to Vagrant and Docker for developer environments.

EDIT: reading more of the docs, it really shows that the author is familiar with all of my use-cases. It really looks fantastic.

EDIT2: it seems like it's missing the docker "link" functionality.