SupportYourApp - Connecting talented people with the blooming IT industry to help them grow faster by outsourcing support.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Zervicio - Customer Support Services
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
nService - Web based help desk software that helps you help your employees and customers. Easy to use. Customizable. Free trial.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.