You are welcome to use mine. It is pretty straightforward, has a simpler and easier to use interface than the cron-based ones, and since it’s written in C it’s pretty portable among distros and revs. I have compiled it with no source code changes on RHEL3 through RHEL7, so even systemd didn’t phase it…
Basically you use your local inotify constants to define path triggers (like, if someone does CLOSE_WRITE in this folder) and hits on the trigger call a user-written scriplet written in your language of choice (I use perl and bash mostly, but it doesn’t care if you want Java, PHP, or even Brainf***).
The code’s tight and short enough that you can audit it yourself, even if you are not a C-lord.
