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Re:BitTorrent Is Now Part of TRON by zipwitch on Monday July 30, 2018 @05:33PM (#17648258)
I've been using Syncthing for the same purpose.
Re:BitTorrent Is Now Part of TRON by Fnoord on Tuesday July 31, 2018 @05:54AM (#17651832)
Syncthing, Rsync, both open source and cross platform. Nextcloud also supports WebDAV IIRC.

For sending a file over LAN without using a protocol such as SSH, magic-wormhole works well.

SSH works fine for sending/receiving data, but like FTP it chokes with high amount of small files. So its best, as usual, to use tarballs or zips.