Enterprise PostgreSQL Query logAnalyzer (epqa), it parses huge postgres log files, and shows html report. This report will be very useful for doing database optimization, and in fine tuning the psql queries. It parses compressed files also.
Pothos is an iptables loganalyzer. 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.