Angle 2 Mockups - A giant Sketch Library for creating app presentations
SendBird - SendBird is messaging-as-a-service.
Velvet UI Kit - Cozy iOS UI Kit designed for Sketch 🌸
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Avataaars - Mix and match avatars with a Sketch library
Live800 - Live800 is an enterprise-grade Live Chat and Customer Service platform that enables businesses to provide instant support to their customers through a variety of channels, including Live Chat, Email, Phone, and Social Media.