RackTables - Racktables is a nifty and robust solution for datacenter and server room asset management.
Ansible - Radically simple configuration-management, application deployment, task-execution, and multi-node orchestration engine
DCImanager - DCImanager is a platform for managing physical equipment. Connect any physical equipment to a single platform. Use the platform to manage your servers, switches, PDU as well as physical and virtual networks.
Jenkins - Jenkins is an open-source continuous integration server with 300+ plugins to support all kinds of software development
Opendcim - a free, web based Data Center Infrastructure Management application.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.