HelpScout - Help Scout is a simple, straightforward way to provide excellent support
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
Front for iOS - The first inbox for teams
Zoho Desk - Industry's first context-aware Helpdesk Software
Helpy.io - Helpy is a tightly integrated customer support platform that combines ticketing, knowledge base, community and AI support chat.
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.