Intelligently block brute-force attacks by aggregating system logs
AWStats Log Analyzer
ISC dhcpd leases usage analysis
Snare Enterprise: bit.ly/Snare-Trial
Open Source SIEM
A multi-platform universal log collector and forwarder
Free-SA is report generating tool for web, proxy and mail log files
Squid log data warehouse
Log text into graph on python and javascript.
Over 600 classes for Web, RFC & File Management
Project's new home: https://github.com/Stunner/FileZilla-Log-Analyzer