Lilith - Logging and access event viewer for Logback
eclipse logviewer - Eclipse Plug-in for tailing log files and eclipse consoles (e.g. SVN, Java Stack Trace, CDT), including syntax coloring with either a regular expression or a word match. It allows you to have multiple logs open concurrently.
JLogViewer - Lightweight pure java graphical application to easily view and manage log files generated by the "java.util.logging" package. So far it can handle only file formatted with the "XMLFormatter" class.
LogSaw - High-performance log viewer based on Eclipse
LogView4J - Java Swing Log4J socket listener GUI that makes application debugging simple.
log2web - Supports different logging systems, web interface.