Slogger is a session keystroke logging utility. The goal of the design is to provide the same features available in many commercial products, but under the GNU license.
The cpp_trace is a flexible and compact logging C++ library. The library provides a facility to filter and route between output streams text trace messages. It uses generic type-safe design and conforms to STL io stream concepts.
This is a logging API for Ada. It's not a port of log4j. This library seeks to be ultra-flexible whereas log4j was designed to be efficient. The design is essentially a graph of message stream arcs and message processing nodes.