E-goi - Email Marketing companies, SMS Marketing, software email marketing.
TapTalk.io - TapTalk.io is a complete in-app chat SDK and messaging API - Easy integration and customizeable.
Octopush - Octopush is a company providing technology-based communication solutions, including SMS, Web solutions, and Email APIs.
Lets Chat - Open source self-hosted chat app for small teams
Maytapi - Serverless Whatsapp Api with Chat and Agent support.
MongooseIM platform - The massively-scalable XMPPJabber mobile messaging platform, for mobile and web, by Erlang Solutions