etherdam is an IPTables firewall configuration engine. It implements a primitive (and hopefully simple) scripting language as an alternative to the direct use of iptables. It comes with full documentation plus a heavily-commented example config file. The config file should work for many scenarios with minimal adjustment.
Mondo is a very simplistic health monitoring daemon that relies on lm_sensors. It is capable of monitoring whatever settings you're willing to assign a label to in your sensors.conf file. It provides the same function as Motherboard Monitor, except it lacks a GUI interface and is specific to Linux.