Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
SupportYourApp - Connecting talented people with the blooming IT industry to help them grow faster by outsourcing support.
HiOperator - HiOperator is a virtual assistant that answers phone calls, chats with customers, provides in-app help, takes orders, and provides support.
Zervicio - Customer Support Services
GetHuman - Find customer service numbers fast
nService - Web based help desk software that helps you help your employees and customers. Easy to use. Customizable. Free trial.