Open Source Asset Management Software
IT asset management is really a reconciliation problem: the spreadsheet, the purchasing records, and what is physically plugged in never quite match, and the gaps are where unpatched machines and forgotten licenses hide. The open source tools here track hardware, warranties, licenses, and assignment history in a database you can query directly and tie to your own discovery scans, so the audit trail is something you can verify rather than trust.
NetBox
Source of truth for network infrastructure: IP address management and data center infrastructure modeling
GLPI
Open-source IT asset management and ITIL service desk with built-in inventory, tickets, and CMDB
Shelf
Open-source asset management for equipment, bookings, inventory, and team custody tracking
Ralph
Asset management, DCIM, and CMDB system for data centers and back offices
OTOBO
Web-based open source ticketing for help desks, customer service, ITSM, FAQs, and CMDB-backed assets
OCS Inventory NG
Open-source asset inventory and software deployment console for hardware, software, and network discovery