Tiny PXE Server - Small portable standalone PXE server (dhcp+tftp+http)
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.
AOMEI PXE Boot - Free AOMEI PXE Boot is one of the best PXE boot software which enables you to start up multiple client-side computers within LAN through the network from ISO image file on a server-side computer for system maintenance and optimization.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
TFTPD32 - A free tftp and dhcp server for windows, freeware tftp server
Zabbix - Track, record, alert and visualize performance and availability of IT resources