IPWatch will reconfigure your machine after an IP change by reinitializing the hostname, restarting the system logging facilities to use the new hostname, restarting your firewall, and updating your dynamic hostname (it supports yi.org, homepc.org, justlinux.com, dhs.org, dyndns.org, and dyndns.com). It will also restart your network if your machine loses connectivity. In both cases, email is sent with a full log of everything that's been done (including your new IP address).
KSnuffle is a network packet sniffer for KDE. It supports multiple concurrent sniffers, packet filtering (aka tcpdump), event triggers and commands, text and binary logging (and replay), remote sniffing (via a demon process), and dynamically loadable plugins. Network traffic is displayed graphically and in detail; supplied plugins summarise traffic by direction (incoming, outgoing), source, and destination.
Cerber Grid is a light-weight high performance Java grid system that combines simplicity and easy of use with a powerful and versatile architecture. It contains a Web interface that allows a user to submit and view jobs, view statistics on the controller and the nodes, and perform other administrative functions.