Depends on where you want to transfer your files. Do you want to sync your files to a server? Syncthing is perfect for that. SFTP and SCP also work well enough for that. Do you need to send a file to somebody else? Check out croc or portal.

https://github.com/positive-intentions/chat

It uses webrtc for P2P connections.

In order of personal preference:

scp (sftp)

rsync/openrsync

nfs

host files on an ftp server with ftpd

hosting files on an http server with httpd

Syncthing is pretty good.

One of the GUI versions of Magic Wormhole is the best and easiest way. Here’s my favorite https://rymdport.github.io/

FileZilla.

The easiest thing would be to mount a remote network storage as a local directory. This way you can easily access it to read and write through normal software.

why not something as basic as sftp?

If you're on linux just use scp

I wrote my own. I aimed for a different UX than most services. For my use case I have a few devices that I often share files between. So opening the tool on both devices was a bit annoying. Instead you select the file on the first device and you get a push notification on the other. Then the transfer is done over WebRTC (locally if possible). All communication is done end-to-end encrypted and over your browser's push service.

Hosted: https://filepush.kevincox.ca/

Source: https://gitlab.com/kevincox/filepush

maybe 0up.io?

Oh, over the Internet, not just the local network ... then maybe Lufi?

for example this instance: https://upload.disroot.org/

Works well, but not particularly fast with large amounts of data (up to 2GB possible)

KDE-Connect? https://kdeconnect.kde.org/

It works very well for the data exchange between Linux, Android, iOS and Microsoft devices. https://apps.kde.org/kdeconnect/

Of course, it can do a lot more, it's a bit oversized for just data exchange

FTP

"File Browser" or "Sharry" allow you to make public links to share files with others BUT you need to run them on a server that is accessible to both parties.

Syncthing?

rsync

Edit: Or maybe you want a GUI?

pairdrop.net maybe?

It's mainly for local network, but you can do internet transfers.

https://github.com/schlagmichdoch/pairdrop#features

Wormhole

@7_Stipend_Jackal Not really sure what you mean by "like Localshare". Is that a specific piece of software, or do you just mean sharing files between two devices on a local network via whatever protocol?

I've played around with croc a while back just to test, seems okay.

SFTP should come with your OS. If you're on *nix, some fiddling around with usergroups is recommended for security reasons.

OnionShare is FOSS and transfers files over TOR network.

https://f-droid.org/packages/org.onionshare.android.fdroid/

Syncthing

OnionShare

Croc, although it's command-line only.

Syncthing is also great but may not be what you're looking for.

I don't think the entire service is open source but I really like https://wormhole.app/