Clearstream - Clearstream is a SMS marketing and online texting software.
TapTalk.io - TapTalk.io is a complete in-app chat SDK and messaging API - Easy integration and customizeable.
E-goi - Email Marketing companies, SMS Marketing, software email marketing.
Qiscus - Engage your customers from your own apps and mainstream chat apps like Whatsapp, LINE, Facebook Messenger, Telegram, Email, Twitter, Instagram, etc. and centralize all chats into a single dashboard.
Swift SMS Gateway - SMS Gateway is your bridge between the Internet and the world of cell phone SMS text messaging.
Chat by Stream - Build and ship in app messaging in a few hours