Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
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.
Crisp Chat - Multi-channel customer support software
Avochato - Text messaging for your business.
HubSpot Conversations - Live chat, bots & team email -- free.
Interbot - Get work done right from your chat app