What are some alternatives?
When comparing SHAREit and Send Anywhere, you can also consider the following products
FilePizza - Open source application used to transfer file via WebRTC and WebTorrent.
WeTransfer - WeTransfer is a free service to send big or small files from A to B.
Dukto R6 - Dukto is an easy file transfer tool designed for LAN use.
AirDroid - Access Android phone/tablet from computer remotely and securely. Manage SMS, files, photos and videos, WhatsApp, Line, WeChat and more on computer.
Firefox Send - A file sharing which allows you to send encrypted files to other users.
ShareDrop - HTML5 clone of Apple's AirDrop - easy P2P file transfer powered by WebRTC