Log4j Viewer is an Eclipse plugin which can read various patterns of log4j's log file and show them in a structured table view which filtering, sorting, searching may apply on.
A powerfull tool for analysing application servers logs (websphere, websphere portal, j2ee, custom) in a cluster (or not). It can analyse any log format thanks to a parser plugin approache. You can easily develop your own parser in java (for jboss, bea,.
Provide a plugabble and configurable alternative to UNIX tools like grep, awk, tail, head, cut, sort, uniq or even some perl based scripts in a Java environment. A bit like what Apache Ant means to good old make.
LittleWebStats is an Open Source project written in Java that aims at producing accurate information on Web Site Visitors behavior.
It uses JFreeChart Library for creating the charts.
SimpleLogViewer is Java 2 based GUI application that display logging data. Can read a file or listen over a TCP socket. Use plugins/embedded scripts to Hide, Rewrite, Colorize lines of log.