Talkus - Chat with your website users from Slack
Slackin - Create your own public Slack chat community
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.
Hamster Pad - A social network built on top of Slack
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Mio - Powering seamless communication between workplace chat apps.