Inqlude provides a comprehensive listing of all existing libraries for developers of applications using the Qt toolkit. Inqlude is run by the community and open for contributions.
qlogsystem is a very efficient and easy to use logger library
qlogsystem brings Java style logger hierarchy to C++ with a very simple API. qlogsystem is very fast. The log messages and their parameters are evaluated only if the log level is big enough, so debug messages will not affect the performance much.