Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions
Zopim - Live chat is a faster and more personal way for you to engage your customers. Free for 14 days. No credit card required.
Tailwind CSS - A utility-first CSS framework for rapidly building custom user interfaces.
Crisp Chat - Multi-channel customer support software
Materialize CSS - A modern responsive front-end framework based on Material Design