Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
UI Movement - The best UI design inspiration, daily
Drift - A messaging app that helps you grow your business.
UI Garage - Specific mobile and web design patterns for your inspiration
Talkus - Chat with your website users from Slack
UpLabs - The best material design, iOS & web resources, every day