a tool with a similar purpose like chef, but instead of running on rails this is python that can run in a virtualenv.
its focus is mostly on remote scripting in python. this includes shell access and more over ssh.
examples: fabrics own fabfile
"could you let a script run that checks for free space, and maybe delete some logfiles on all production servers, please ?"
A recommended read on this: Tools of the Modern Python Hacker: Virtualenv, Fabric and Pip, IPython and virtualenv and Fabricate Your Way to Better Deployment