PartKeepr - PartKeepr is an open source inventory management system that you can alter according to the particular requirements of your business or of the area from where you are operating.
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.
PartsBox - The complete solution for building electronics.
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.
BOMIST - Parts Inventory and BOM Management for Electronics
Opendcim - a free, web based Data Center Infrastructure Management application.