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

Twilio - Brings voice and messaging to your web and mobile applications.

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

Plivo - Plivo simplifies your customer engagement.

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

MessageBird - Reach 7 billion phones in seconds via SMS, Chat & Voice. Try it for free and improve your communication.