Cfengine!

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.

Rudder is an easy to use, web-driven, role-based solution for IT Infrastructure Automation and Compliance. With a focus on continuously checking configurations and centralising real-time status data, Rudder can show a high-level summary (“ISO 27001 rules are at 100%!”) and break down noncompliance issues to a deep technical level (“Host prod-web-03: SSH server configuration allows root logins”).

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.

munki is a set of tools that, used together with a webserver-based repository of packages and package metadata, can be used by OS X administrators to manage software installs (and in many cases removals) on OS X client machines.

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.

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.