Chat Center - Chat with one click, no matter what messaging app you use
Service - Customer service issues solved for you, on demand, for free.
KeyReply - Omnichannel keyboard for mobile teams to respond better and faster.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpStack - Open Source mobile help framework to support iOS and Android app users.
LiveMessage from Salesforce - Make mobile messaging a cornerstone of customer service