I have gotten a lot of use out of croc. https://github.com/schollz/croc
F-droid has an android app and the cli runs on Linux, Mac, and Windows. Super pain free. It's not a synchronization solution, but sends stuff pretty easily.
F-droid has an android app and the cli runs on Linux, Mac, and Windows. Super pain free. It's not a synchronization solution, but sends stuff pretty easily.
(sending computer)
computer-1$ croc file-i-want-to-send.txt
Did you mean to send 'file-i-want-to-send.txt'? (Y/n) y
Sending 'file-i-want-to-send.txt' (555 B)
Code is: 1234-some-diceware-passphrase
On the other computer run
croc 1234-some-diceware-passphrase
(receiving computer) computer-2$ croc 1234-some-diceware-passphrase
Accept 'file-i-want-to-send.txt' (555 B)? (Y/n) y
Receiving (<-127.0.0.1:44404)
file-i-want-to-send.txt 100% || (555/555 B, 105 kB/s)
You can also just drag-and-drop a file onto the executable icon and it will pop up a GUI letting you do the same thing. Transfer is encrypted, no account needed.