Foreman

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.

Foreman provides comprehensive, interaction facilities including a web frontend, CLI and RESTful API which enables you to build higher level business logic on top of a solid foundation.

Foreman is 4+ years old, and deployed in many organizations, managing from 10s to 1000s of servers. It is used in distributions such as RDO and RHOS (Red Hat OpenStack distribution) and has an extensive library of plugins.