Spike.sh - Spike is an incident management platform that alerts via slack, phone and email and automatic escalations to help teams fix infrastructure problems.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Clerk - Clerk.io, the artificial intelligence for e-commerce that knows your customers interests.
Sonar - 2-way chat with your customers over SMS and FB Messenger
Sendblue - Programmatically send iMessage and SMS
ThroughMessage - Uncomplicated customer chat for ecommerce websites