Plugin geochat makes it possible to talk with users mapping nearby (in a 20 km radius). it is highly useful at mapping parties, and also for novices who are interested in regional mapping practices.
When the panel is opened, it will ask for a name, and then a chat panel will be shown. It is not required to keep it open: if someone posts a message, an asterisk in a panel header would notify you of that. If a message addressed specifically to you appears, an asterisk would be replaced with exclamation marks.
Right mouse button click opens a popup menu, from which you can enable a map layer with all nearby users on it, copy selected text to a clipboard, ot open a tab for talking with a nearby user privately.
Warning: the plugin regularly sends to a server a location of a place you are editing, which is then distributed among users mapping nearby. This is a mandatory functionality, it can be disabled only by not logging in to a geochat server.