Quality Open Software (QOS) - Offers support on log4j as well as information concerning a book on this topic. JavaLog - A logging class library with runtime configurable formatting and event filtering. [Open Source, MPL] Java Syslog - Java based syslogd client and server implementation. [Open Source, GPL] Lumberjack - This API Conforms to the Logging API in JDK1.4, but is available for pre-1.4 JDKs. Chainsaw - An application for visual viewing and filtering of log4j events. [Open Source, GPL] 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. 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] 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. JDBCAppender - Log4J compatible for logging messages to database. [Open Source, APL] Java Logging Framework - Framework for logging in Java. [Open source] Log4j - Logging package for printing log output to different local and remote destinations. Selection and filtering of log events at runtime. [Open Source, APL] Java Logging Tools and Frameworks - Guide and directory of Java logging tools, comparisons, libraries, articles and tutorials for developers interested in logging and tracing with Java. JLogger - Java logging library that can be configured to log messages to multiple destinations. Last version: 2003. [GPL, Open source] Jalore - Java Log Reader - Library for reading log files. Site includes user guide and download option. [Apache License v2] JDLabAgent - Java debugging agent which can be loaded into the JVM and can log JVM events like breakpoints and exceptions. [GNU Library or LGPL]