Octopush - Octopush is a company providing technology-based communication solutions, including SMS, Web solutions, and Email APIs.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
CheapGlobalSMS - Send instant bulk SMS worldwide, with reliable SMS delivery and reports in real-time.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Maytapi - Serverless Whatsapp Api with Chat and Agent support.
Facebook Messenger - Facebook Messenger is a faster way to message.