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.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Smallchat Beta - Slack integration for chatting with visitors to your website
Avochato - Text messaging for your business.
Crisp Chat - Multi-channel customer support software
Dossier Chat for Slack - Reply to website chats and customer emails on Slack