Fabric!

Ansible is a radically simple IT automation engine that automates cloud provisioning, configuration management, application deployment, intra-service orchestration, and many other IT needs.

Puppet Data Center Automation Solution helps you save time, gain visibility into your server environment, and ensure consistency across your IT infrastructure.

RunDeck is an open source automation service with a web console, command line tools and a WebAPI. It lets you easily run automation tasks across a set of nodes.

Foreman is an open source project that helps system administrators manage servers throughout their lifecycle, from provisioning and configuration to orchestration and monitoring. Using Puppet or Chef and Foreman's smart proxy architecture, you can easily automate repetitive tasks, quickly deploy applications, and proactively manage change, both on-premise with VMs and bare-metal or in the cloud.

cdist is an alternative to other configuration management systems like cfengine, bcfg2, chef and puppet. But cdist ticks differently.

SAM-Solution is a management tool for IT-infrastructures, intended for companies. It allows to centralize system and software migrations, as well as backup and restoration of user data. This tool design goal is to help the system adminstrator of a company in his work, and to be easily usable by the final user.

Mina is a really fast deployer and server automation tool written in Ruby.

Invoke is a Python task execution tool & library, drawing inspiration from various sources to arrive at a powerful & clean feature set.

FAI, Fully Automatic Installation, is a non-interactive system to install, customize and manage Linux systems and software configurations on computers as well as virtual machines and chroot environments, from small networks to large-scale infrastructures like clusters and cloud environments.

A simpler way to manage servers online. Commando.io empowers users to be more efficient, improve their workflow, and eliminate anxiety over server provisioning, maintenance, and deployment. DropBox simplified online storage, GitHub simplified revision control, Commando.io simplifies server management.