System Health Monitor is a handy python program that will setup your system to generate RRD Graphs of network interface traffic, system load, memory usage, disk space and inode usage and running processes.
EPAN is a protocol analyzer for ethernet networks. The program allows you to display the received frames either in an overview mode or in a frame detail mode.
Snowlog lets you browse your web server's access log files. It does not generate static HTML status reports but instead shows you all accesses in a list that you can filter, sort and search easily.