File Management

Syncthing is a free and open-source continuous file synchronization program written in Go. It synchronizes safely protected files between two or more computers in real time.

Free and open-source HTML5 clone of the Apple AirDrop service.

Open source local network utility written in C# using .NET 4 by the author of RaptorDB.

Simple NirSoft tool that monitors a folder or disk and lists every filename that is being modified, created, or deleted. Free for personal use.

Rclone - "rsync for cloud storage" is a command line program written in Go to sync files for a plethora of cloud storage providers.