F-Watch is a kernel module that reports changes on files to /dev/fwatch. It hooks into the sys_calls and does not require a kernel patch. To activate watching for certain events, users need to run ioctl to register the wanted events; examples are in the src dir. Ioctl can be used during runtime to individually change the required events.
Panasync Tools provides a set of commands that enables version tracking among plain file copies. Retaining the basic functionality of standard copy commands, one can always track if a file has seen more updates than another file, and determine redundant or equivalent file copies. The approach is totally decentralized and serverless, and the functionality is achieved by small command-line user level programs that manipulate (by duplicating, comparing, joining and moving) any given file. By copying files with these commands users can detect if those files forgotten on disks or dispersed on different file systems and computers hold obsolete versions, and can thus be deleted, or need to be merged when depicting parallel updates. The updates, themselves can be done by any application since the system keeps a digest of the files to detect changes.