Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Invision - Prototyping and collaboration for design teams
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Sketch - Professional digital design for Mac.