HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Ticksy - Simple, beautiful customer support.
Hiver - Manage Customer Support, Sales and Projects right from your Gmail inbox. Collaborate with Shared Labels, Shared Contacts, email notes, email reminders and email templates
HelpNinja - Simple & Affordable help desk
Crisp Chat - Multi-channel customer support software
SupportYourApp - Connecting talented people with the blooming IT industry to help them grow faster by outsourcing support.