SlackPass - Subscription access to anything with Slack
Grapevine Surveys - Grapevine is an online survey tool for employee surveys.
InviteRobot - Instant subscription for paid Slack communities
Quorum - Quorum provides tools to create outreach efficient, effective and people-centered field actions.
Café - When should I go to the office?
Slack Message Buttons - Making messages more interactive with buttons