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PairDrop
Discontinued PairDrop: Local file sharing in your browser. Inspired by Apple's AirDrop. Fork of Snapdrop.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
What is possible on the other hand is to simply host an instance of PairDrop yourself in your local network e.g. on a Pi with node.js or Docker. See https://github.com/schlagmichdoch/PairDrop/blob/master/docs/host-your-own.md for more information.
You can also create another instance using a free account on https://render.com/ that builds the app directly from the repository and automatically deploys.
I am happy though, that there does indeed exist a possibilty to share between devices cross-platform without the requirement to be online: As already mentioned on another comment there is an alternative called Localsend that is perfect for sending files on a local network where devices are allowed to discover each other (e.g. your home Wi-Fi).