InviteRobot - Instant subscription for paid Slack communities
Jodel - What is Jodel all about? Jodel is the community that shows you what's happening in your area in real-time.
SlackPass - Subscription access to anything with Slack
Berkanan - Chat with people nearby. Even offline, on an ✈️.
Grapevine Surveys - Grapevine is an online survey tool for employee surveys.
Treadie - Create your own micro-social network for topics