Multiplex, an app to watch torrents together. It provides an experience similar to Apple's SharePlay and Amazon's Prime Video Watch Party, except for any torrent instead of a specific streaming service. Thanks to WebRTC, it doesn't require a server to sync playback, and can use a gateway if a viewer can't use BitTorrent. It's written in Go for GNOME; check it out on GitHub https://github.com/pojntfx/multiplex