LocalSend

LocalSend is a free, open-source app for sending files and text to nearby devices over the local network, working like AirDrop across Windows, macOS, Linux, Android and iOS. Transfers stay on your Wi-Fi with no internet, account or servers, are encrypted over HTTPS with optional PIN protection, and run at the network's full speed. Designers on mixed platforms use it to move assets between phones and computers, and its install, select and tap flow is a good model of zero-configuration UX.