When v2 of Directory Monitor started being developed, I kept Mono (http://www.mono-project.com/) in mind to also support Linux and had the application running using Mono in Ubuntu.

I have not been actively testing Directory Monitor in Linux although it is entirely possible to have a functional build that will provide the same features on a Linux distribution running Mono.

If there is enough interest in this (votes) then I will provide an official build and fully supported version to the public.