glogg is a multi-platform GUI application to browse and search through long or complex log files. It is designed with programmers and system administrators in mind. glogg can be seen as a graphical, interactive combination of grep and less.
httpsum is a highly configurable log file analyzer that lets you filter and summarize Web hits. Its powerful filtering mechanism will let you generate custom analysis summaries after transformations and filters have been applied.
SonicLog Cruncher is a script for analyzing Sonicwall Firewall logfiles. It creates a text file containing statistical data: hits per protocol, hits on a daily basis, hits on an hourly basis, and VPN connection summary.