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.
Chef - Automation for all of your technology. Overcome the complexity and rapidly ship your infrastructure and apps anywhere with automation.
NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.