Service - Customer service issues solved for you, on demand, for free.
AirHelp - Get paid when you're delayed!
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
AirAdvisor - AirAdvisor is an airline compensation company advocating for air passenger rights
LiveMessage from Salesforce - Make mobile messaging a cornerstone of customer service