IMLogger provides a usable program to enable network administrators to log certain instant messaging activities (namely, login and logout). AOL is currently supported, with Yahoo, MSN, and Jabber protocols in the works. This is very useful in Universities where campus police want to trace a SN back to a port/dorm room.
IP Traffic Volume uses Linux kernel iptables to log incoming and outgoing bytes though your network device(s) and can dump summarized log statistics in ASCII to the console or display in HTML via the included CGI interface for displaying on a Web server. It is highly configurable as to what kind of traffic is counted, e.g. to and from specific ports and/or specific IP addresses or groups of ports and addresses. It uses a mininum of resources and doesn't need a database for the logged data.
IPFS (IPSquad Package From Source) is a system which allows you to trace an program's installation from sources and register it in your favorite packaging system (only the Slackware package system and RPM are currently supported). IPFS watches a command (generally make install), collects the list of added files, and then registers them in the chosen packaging system as if the install was made from a normal package. Unlike other similar products, IPFS is able to track both shared and statically linked programs.