HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Service - Customer service issues solved for you, on demand, for free.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
AirHelp - Get paid when you're delayed!
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
CashBackAir Bot - Chatbot gets compensations in case of a flight delay