GitHub repository: CryptoManiac/g3log
Description: G3log is  an asynchronous, "crash safe", logger that is easy to use with default logging sinks or you can add your own.  G3log is made with plain C++14 (C++11 support up to release 1.3.2)  with no external libraries (except gtest used for unit tests). G3log is made to be cross-platform, currently running on OSX, Windows and several Linux distros.