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collaborative map software?
(slrpnk.net)
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This might be fun to write actually. Basically you need a central server you connect to via a websocket that would plot points out on a map (maybe with leaflet?) on receipt of notifications pushed via said socket.
The trouble of course is that with a central server, you tend to incur costs, so you'd have to pay, unless some sort of P2P mesh could be established between participating parties. That'd be a fun problem to solve for sure.
WebRTC can be used, and there is public STUN or TURN server