Vtiger Help Desk - Vtiger Help Desk provides multi-channel helpdesk solution.
Hubspot Service Hub - HubSpot's customer service software makes supporting customers easy. Help your customers on the channels they prefer, while driving efficiency for your team.
Service Creatio - The Omnichannel Customer Service and Support
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.
Zendesk Suite - The complete Zendesk suite in one package
Oracle Service Cloud - Web, Social & Contact Center