SysLog Summary summarizes the contents of a log file written by syslog. It displays each unique (except for the time) line once, and also shows the number of times such a line occurs in the input. The lines are displayed in the order they occur in the input. It is also possible to define some rules to ignore certain lines by using regular expressions.
PHP Logging Class can be used to log activity to a database. It can add activity entries to a log database table. It logs the activity priority level and class, the remote user identifier (if logged), and its computer IP address. Optionally, it can send email about the activities being logged to a given email address. It can also display log entries as an HTML table.
Service Guardian aims to protect servers against various things such as resource exhaustion and connection floods. It can measure the number of connections to servers' ports and, after a grace time period, compares and sees if the host is still in violation of the specified settings. If a host is in violation of the settings, it will be filtered out and dropped via netfilter/iptables.
Virt-df is a df implementation for virtual guests. The program is meant to be run on the host or dom0 to display disk space used and available on all partitions within all guests. There is no need to run any software or agent inside the guests. It is compatible with most Linux and Windows guests.
pypty is a tty logger aimed at heavy script(1) users who like to (or would like to start to) log everything they do on important systems. It creates one (or two, if you ask for timing data) file(s) per day. The distribution also includes "script-replay", which is somewhat like the traditional scriptreplay - that is, it's for replaying tty logs - but it does not require timing data and lets you step forward and back in the log.