Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Talkus - Chat with your website users from Slack

Crisp Chat - Multi-channel customer support software

Speaklyn - Website visitors chat with you on Facebook Messenger

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

WhatsHelp - Communicate personally with your customers via Messenger