Zombie Loyalists - Using Great Service to Create Rabid Fans
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
Crisp Chat - Multi-channel customer support software
Open Loyalty for Startups - Open source stack for building customer focused products
Drift for Enterprise - Automatically turn website traffic into sales meetings