ISC DHCP - Enterprise-grade solution for IP address-configuration needs
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
TFTPD32 - A free tftp and dhcp server for windows, freeware tftp server
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
haneWIN DHCP - haneWIN DHCP Server is a great platform that provides a BOOTP/ DHCP server entirely based on RFC 2131.
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.