Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Avochato - Text messaging for your business.
Twilio Flex - The programmable contact center platform 📱
Message Me - Website to create your contact business card
Drift - A messaging app that helps you grow your business.
Slack with your Users - Speak to your app's users entirely within Slack