Tiny PXE Server - Small portable standalone PXE server (dhcp+tftp+http)
dnsmasq - Dnsmasq is a lightweight, easy to configure DNS forwarder and DHCP server.
ERPXE - ERPXE project simplifies the process of installing and customizing a Multi-Boot PXE server.
BIND - BIND is by far the most widely used DNS software on the Internet.
Serva 32/64 - Serva is an Automated PXE Server Solution Accelerator based on an all-in-one portable multi-server engine
PowerDNS - PowerDNS offers open source DNS software, services, and support.