Grapevine allows you to chat with others across other realms connected to the Grapevine chat network. These realms could be in a different universe or even a different dimension. This means you should always have someone to talk to. See https://grapevine.haus for more details. They also have a cool web client that you can use to access this realm.
gvgame - to see a list of games online.
gvplayer - to see players online
gvchannel - universal gossip to all Grapevine games, or change your channel
gvtell - to send private tells to players in other realms