Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.
avaamo - Simple, Secure Business Messaging
Reqtify - Reqtify is an easy to use, interactive application for managing requirements.
Facebook Messenger - Facebook Messenger is a faster way to message.
Visure - Visure offers a flexible , modern and complete requirements ALM Platform (Application Lifecycle Management).
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.