The Galene videoconferencing system <https://galene.org https://galene.org> includes peer-to-peer file transfer. The web client is built in, but there's also a

The Galene videoconferencing system <https://galene.org https://galene.org> includes peer-to-peer file transfer. The web client is built in, but there's also a command-line client at <https://github.com/jech/galene-file-transfer https://github.com/jech/galene-file-transfer>.