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