I was too quick with my earlier message. I don't think anybody mentioned OpenBSD implementation of dhcp server and client. IIRC FreeBSD uses OpenBSD version of the client for its base installation. Traditionally FreeBSD doesn't come with dhcp server which needs to be installed from ports.
OpenBSD has its own sensorsd which is pure gold and unlike other BSDs IPMI driver is disabled from generic. FreeBSD has half finished native sensoring framewark but encourages the use of IPMI. OpenBSD has its own SNMP daemon. Somebody could probably clarify what is the relation to "BSD SNMP" (bsnmp) daemon found in FreeBSD for example. The OpenBSD snmpd comes with bunch of custom MIBs comparing to net-snmp which can be installed from the ports and it is too bad that no tool can out of box pool all PF for example related stuff into RRD and display it in nice fashion (at least Observium which I am using is not capable of doing it). While on the topics of various monitoring utilities. IIRC symon http://wpd.home.xs4all.nl/symon/documentation.html is developed on OpenBSD. Also fdm is developed by an OpenBSD person http://sourceforge.net/p/fdm/git/ci/master/tree/MANUAL Predrag
