A cross-platform file change monitor with multiple backends: Apple OS X File System Events, *BSD kqueue, Solaris/Illumos File Events Notification, Linux inotify, Microsoft Windows and a stat()-based backend.
GPL-3.0 License
libfaketime modifies the system time for a single application
libsv - Public domain cross-platform semantic versioning in c99
Instrument your C/C++ programs with traces, see them in chrome://tracing