Stockpile - Stockpile is a free online inventory system for small business and at home uses.
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.
inFlow Inventory - inFlow Inventory is inventory management software for small businesses.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
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.