HiOperator - HiOperator is a virtual assistant that answers phone calls, chats with customers, provides in-app help, takes orders, and provides support.

Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Service - Customer service issues solved for you, on demand, for free.

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

LiveMessage from Salesforce - Make mobile messaging a cornerstone of customer service

Zoho Desk - Industry's first context-aware Helpdesk Software