Salt is a powerful remote execution manager that can be used to administer servers in a fast and efficient way.
Salt allows commands to be executed across large groups of servers. This means systems can be easily managed, but data can also be easily gathered. Quick introspection into running systems becomes a reality.
Remote execution is usually used to set up a certain state on a remote system. Salt addresses this problem as well, the salt state system uses salt state files to define the state a server needs to be in.
Between the remote execution system, and state management Salt addresses the backbone of cloud and data center management.
Chef-like functionality for Fabric
Kraftwerk WSGI is a command line utility that enables easier deployment and commissioning of cloud servers. Kraftwerk has hooks to customize setup of server nodes and WSGI projects. Kraftwerk places loose constraints on project structure and paves the way for local full stack testing and staging.
Deployment in WSGI land is too time consuming when dealing with multiple sites. Kraftwerk is Python website sysadmin made easy.
I'm using x|encon (http://www.xencon.net/) for my Django hosting. Might add that in the future.