DNSdoctor is a tool based on zonecheck that is intended to help with solving misconfigurations and inconsistencies in DNS zone files. It features a powerful configuration file, does not depend on policies, fine grained test selection (by test, categories, or zones), full IPv6 support (connectivity and AAAA records), and several input/output interfaces (CLI, GUI, CGI, and a dedicated mode for use inside shell scripts). It uses threads to cut down checking time and can be extended with new tests, interfaces, and reports, and features exception and cache mechanisms to simplify test writing.
qfan.rb manages the CPU fan to act on CPU temperature just like the ASUS Q-Fan does on P4P800 motherboards. Other motherboards are untested. It features a daemon mode. All speeds and temperatures are configurable, so select a high speed for your fan that doesn't resonate your computer case.
Daedalus provides a simple mechanism for running programs in response to the output of "check programs". In practice, this is generally used to provide an automated restart service for programs by checking the output of "ps axww", and running a start script when a particular program fails to appear. However, it can be used for any occasion where you want to automate an action based on an event in the system. Beyond simple restarting of systems, it can be used to send alerts, clean up files, or even start one program when another finishes or reaches a certain point.
GARP (Gnome ARP) is an ARP monitoring program written on Gnome with the GTK toolkit and Ruby. It takes ARP tables and some system variables via SNMP and ARP protocols and determines whether any machines have changed their IP address. It is useful for detecting new machines on the network and detecting which machine have changed addresses. It is intended especially for network admins.
nVentory is a Ruby on Rails application to manage inventory in multiple data centers. It can manage server functionality assignment, customer/server assignment, racking, and more. It can track which servers are doing what, and where they are in your data centers. It allows you to visualize server locations and rack space with GUI tools.
Websitary is a script that monitors Web pages, RSS feeds, and podcasts and reports what's new. For many tasks, it reuses other programs (such as w3m, diff, and webdiff) to do the actual work. By default, it works on an ASCII basis, i.e. with the output of text-based Web browsers. With the help of some friends, it can also work with HTML.