Chainsaw - An application for visual viewing and filtering of log4j events. [Open Source, GPL]
IBM Logging Toolkit for Java - Provides logging, tracing functions, and filters. Part of the IBM alphaWorks project. [Commercial]
Java Logging API Specification - The home of a Java Community Process expert group defining standard logging APIs for error and trace logging. The latest draft and status history is available.
Java Syslog - Java based syslogd client and server implementation. [Open Source, GPL]
JavaLog - A logging class library with runtime configurable formatting and event filtering. [Open Source, MPL]
JDBCAppender - Log4J compatible for logging messages to database. [Open Source, APL]
Jestr - a Java Extensible Stringifier - Converts arbitrary Java objects into strings for logging. Configured via a properties file similar to log4j.properties. [Open Source, APL]
JLogger - An implementation of the Java logging API (java.util.logging) including a graphical user interface. [Open Source]
Log4E - A Eclipse plugin which helps use logger easily in Java Projects. It's not bound to any special logging framework, but can used with Log4j, Commons Logging, or custom logger.
Log4j - Logging package for printing log output to different local and remote destinations. Selection and filtering of log events at runtime. [Open Source, APL]
Lumberjack - This API Conforms to the Logging API in JDK1.4, but is available for pre-1.4 JDKs.
Quality Open Software (QOS) - Offers support on log4j as well as information concerning a book on this topic.
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