Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
ChatWhale - Gamify your customer communication and loyalty rewards
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
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
Open Loyalty for Startups - Open source stack for building customer focused products