RackTables - Racktables is a nifty and robust solution for datacenter and server room asset management.

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.

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.

Ralph - Ralph is full-featured Asset Management, DCIM and CMDB system for data center and back office.

Opendcim - a free, web based Data Center Infrastructure Management application.

Device42 - Automatically maintain an up-to-date inventory of your physical, virtual, and cloud servers and containers, network components, software/services/applications, and their inter-relationships and inter-dependencies.