AirDrop is described as 'is the simplest way to send files wirelessly to anyone around you. To share a file, simply drag it onto a person’s contact photo. Your Mac verifies that you want to send the file, then sends a request to the recipient' and is an app in the file sharing category. There are more than 50 alternatives to AirDrop for a variety of platforms, including Linux, Windows, Android, Mac and Online / Web-based. The best alternative is Syncthing, which is both free and Open Source. Other great apps like AirDrop are RetroShare, OnionShare, ShareDrop and Snapdrop.
croc is a tool I built to easily and securely transfer stuff from one computer to another.
The only tool that is easily installed and used on any platform, and has secure peer-to-peer transferring, and has the capability to resume broken transfers.
Warpinator is a free, open-source tool for sending and receiving files between computers that are on the same network. All you need do is install Warpinator on the computers, choose a group code, edit your firewalls if necessary, and that’s all.
ToffeeShare is a direct and secure way of sending files via your browser. Your files are never stored in 'The Cloud' but are transferred directly to the receiver. There's no filesize limit, you're only limited to what your device can handle.
Gofile is a free and anonymous file-sharing platform. You can store and share data of all types (files, images, music, videos etc...). There is no limit, you download at the maximum speed of your connection and everything is free.
With Roamit, you can send the webpage you're reading, or something that's on your clipboard, to your PC, mobile or even your Xbox¹, it'll open immediately. Furthermore, you can transfer your photos and files² as fast as possible, via local Wi-Fi network.
Warpinator for Android is an unofficial port of Linux Mint's file sharing tool of the same name. It is fully compatible with the original protocol and allows for easy transfer of files between Android and Linux devices.