There are some Nagios checks here for OpenBSD

• check_hw_sensors (check_hw_sensors-1.23.tar.gz)
  Checks the output from sysctl hw.sensors for nagios.
• check_bioctl (check_bioctl-1.20.tar.gz)
  Checks the output from bioctl for nagios.
• check_openbgpd (check_openbgpd-1.10.tar.gz)
  checks status of OpenBGPd peers.