data.world - The social network for data people
Talkus - Chat with your website users from Slack
Swarmia - Swarmia is an engineering productivity software trusted by 600+ engineering teams worldwide. Use key engineering metrics to unblock the flow, align engineering with business objectives, and drive continuous improvement.
Slacking Pigeons - Chat in real time with your users directly from Slack
Whaller - Create your own free and unlimited private social networks.
Avochato - Text messaging for your business.