DAD is a Windows event log and syslog management tool that allows you to aggregate logs from hundreds to thousands of systems in real time. DAD requires no agents on the servers or workstations. Correlation and analysis is driven through a web front end.
Pothos is an iptables log analyzer. It is used to interpret, in a user-friendly fashion, the logs that ulogd creates with it's MySQL plugin. It's main objective is to be efficient, leaving as small a foot-print as possible.
Php Log Analyzer (aka PLA) is a Log Analysis tool for Apache. There are lots of log analyzer softwares available on the internet but most of them have their own data storage ways. PLA is a tool to analyze log files and store results into MySQL databases.