Как следить за изменениями в папке

Objective-C

CDEvents - Objective-C wrapper of FSEvents

Xcode Apps: Folder watcher on Mac

Stack Overflow

filesystemwatcher - How to get folder changes notifications(folder watcher) in cocoa - Stack Overflow

Equivalent of FileSystemWatcher (.NET) in Cocoa - Stack Overflow

objective c - How to implement watcher to subdirectories? - Stack Overflow

filesystemwatcher - File Watcher in Cocoa - Stack Overflow

C/C++

Using kqueue in Cocoa

Creating a file system watcher for Mac

FSEvents C++ Example - Stack Overflow

A File System Change Logger

FSEvents - Wikipedia, the free encyclopedia

Слежение за изменениями в директории: как это делается в разных ОС / Хабрахабр

Lsyncd

lsyncd - Lsyncd (Live Syncing Daemon) synchronizes local directories with a remote targets - Google Project Hosting

https://github.com/axkibe/lsyncd

Cкоростная синхронизация миллиарда файлов / Хабрахабр

C#

FileSystemWatcher Class (System.IO)

IntelliProject Developers Community : Monitoring File System using FileSystemWatcher Class

Ruby

fswatch: Ruby and FSEvents - Dave Dribin's Blog

Monitoring File Events in linux, mac and windows - Brown Fort

Puncher the simple file watcher for OS X - Raw Syntax

Is it live? |  Tenderlovemaking

Python

Мониторинг за изменениями файловой системы / Хабрахабр