A command line tool that allows you to (live) analyze netfilter (iptables) log files. It provides a nice output and has features like displaying hostnames, duplicate detection... More info (+ screenshots) can be found in the pdf inside the tarball.
A network monitor for the GNOME desktop. Includes overview of processes communicating on the network (similar to top for cpu load), network interface statistics, network statistics overview and iptables loganalyzer.
The Secure Remote Log Monitor (SRLM) project provides client and server
utilities that collect application or system log files from multiple systems over an untrusted network onto a central server for analysis and action.