Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
HelpScout - Help Scout is a simple, straightforward way to provide excellent support
Outbound Apps by Intercom - Embed apps right inside your messages
Intercom App Store - Integrate with Intercom and grow your business
GoSquared Live Chat - Beautiful, simple, and free live chat for your website
indemandly - Live chat 2.0: Customer messaging that converts