InviteRobot - Instant subscription for paid Slack communities
Stealthy: Secret Messenger - Chat anonymously with friends & strangers
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.
Roomvine - Chatrooms for real life venues, neighborhoods and events