Chainsaw - log viewer and analysis tool

Chainsaw is a companion application to Log4j written by members of the Log4j development community. Chainsaw can read log files formatted in Log4j's XMLLayout, receive events from remote locations, read events from a DB, it can even work with the JDK 1.4 logging events.

It has dynamic and powerful filterting which helps to locate stuff easier(e.g. "LOGGER == 'com.mycompany' && LEVEL == ERROR" ).