zCI is freeware for computer inventory. It is free but contains a lot of corporate feature. zCI has 100% web-based user interface, including its automatic data gathering mechanism. Also, zCI has peripheral inventory capability and facilities to manage device ownerships.
zCI provides client programs for Windows and Linux/Unix operating system. The client programs automatically collect hardware and software information, such as hardware list, software list, computer serial number, monitor serial number, MAC address and etc. The free zCI gives you more and better features compared to many non-free inventory softwares.