avaamo - Simple, Secure Business Messaging

Jama - Jama combines requirement management software with enterprise collaboration capabilities to solve product delivery problems.

Facebook Messenger - Facebook Messenger is a faster way to message.

ReqView - Simple and powerful requirements management tool enabling easy requirements gathering, traceability tracking and offline collaboration.

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

Jama Connect - The Leader in Requirements Management Solutions