I was looking for a good and quick file transfer method and stumbled upon Warp on Linux (flatpak). It says the app is open source but I did a quick Lemmy search and someone mentioned the protocol magic wormhole is closed.

Even though I found the application very useful, like I can transfer files even when connected to a VPN service, the closed source nature turns me off.

Also when operating without a VPN, wormhole connects via local network, my desktop is behind a firewall, but the transfer still happen! How does it do that without opening a port in f/w?

Any alternate suggestions are welcome as well.

Edit 1. The domain for the magic wormhole relay and transit server that most open source clients (like Warp) use is magic-wormhole.io. I have to check if they really are open source.

Edit 2. There seems to a mention of the magic-wormhole.io domain in their PyCon 2016 presentation.