We use the free version of Slack for chatting among team members and our invite-only community.
Friendly collaborators, people who subscribe to Polygloss Unlimited, and other VIP players (active members of the community, provided lots of feedback, bug reports etc)
It's not really 😂 At the moment the team has one private channel, all other channels are open. There are channels on a variety of topics, but the ones currently used are mainly #team, #general, and #ideas-and-feedback