Gamin
Gamin is a file and directory monitoring system defined to be a subset of the FAM (File Alteration Monitor) system. It is a service provided by a library which allows for the detection of modification to a file or directory.
Gamin re-implements the FAM specification with inotify. It is newer and more actively maintained than FAM, maintains compatibility with FAM and can replace it in almost every case. It is a GNOME project, but does not have GNOME dependencies.