Talkus - Chat with your website users from Slack
data.world - The social network for data people
Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.
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.