NARC (Netfilter Automatic Rules Configurator) is a free firewalling package for Netfilter/Iptables, released under the BSD license. It attempts to simplify the setup of a firewall (stateful packet filter) via the iptables tools. It is a bash shellscript that generates (hopefully) sensible and secure rules for Netfilter based on a simple configuration file. It features quick setup via a simple configuration file, connection tracking (and fragmentation reassembly), customized logging, probe detection (TCP & UDP), and much more.
Fantulence is a software daemon that uses the hardware monitoring devices available in Linux 2.4 (I2C and lm-sensors). Its goal is to minimize fan noise on while keeping the system acceptably cool. Fantulence is a replacement for Fancontrol (which used lm-sensors). Fantulence automatically discovers sensor devices capable of controlling fan speed and (normally) requires no user configuration.
syncpasswd is an Expect script that synchronizes passwords via SSH on multiple platforms (Linux/BSD, OS X, and Solaris). It takes hostnames as a list of arguments and changes the specified user passwords on those hosts. It outputs results to stdout and logs to /var/log/syncpasswd.log (by default).