Apache Log4j 2 is a versatile, feature-rich, efficient logging API
Apache Log4net is a versatile, feature-rich, efficient logging API
A highly configurable logging framework for Rust
Java distributed tracing implementation compatible with Zipkin backend
Logging Framework for C++
Logger to use from within PostgreSQL
Logging utility for DB2 for LUW written in SQL-PL
IrcAppender forwards important log4j messages to an IRC channel
A fluent language to write perftences
A library for monitoring the garbage collection of app objects
Centralized Logging to a database with alerts and powerful RCP-UI
log4j-gwt enables GWT clients to use log4j
log4j support for native nagios (nsca) integration