Just the original Snapdrop, with complete Node.js server.
Modified https://github.com/Bellisario/node-snapdrop.git so that when server & clients are on the same LAN, clients discover each other.
Download the repository in a folder, cd it, install all dependencies with npm i and use this command: node index.js.
Use this command, instead, to run not locally but in your public "sharable" ip: node index.js public.
Make sure to check your ip address using your OS command.
node index.js LAN
Use this comment, instead, to run when server & clients are on the same LAN so that clients are able to discover each other.