lsnet is a system monitor that generates detailed
charts for viewing on your Web site. One pixel
represents 1 minute. It displays data for one day and also has a daily network usage chart showing how much up/down traffic there was for each day of the month.
Guardog is a simple but powerful intrusion dectection system (IDS) that works by inspecting messages from log files, network packets, and other sources. It uses Perl regular expressions to check for any bad messages.