Racktables is a nifty and robust solution for datacenter and server room asset management. It helps document hardware assets, network addresses, space in racks, networks configuration and much much more!
ODCNMS is an Open DataCenter Network Management System. It makes it possible to manage at network level a DataCenter. You can manage locations (rack, patch panel, port), customers, networks (subnet, ip address, vlan), devices (slot, interface), etc ...
OpenCabling is a program to document, manage and organize the active and passive parts (from campus distributors to floor distributors) of a networking infrastructure. With OpenCabling you can track all your patch and follow the path of your cabling