Telegram API - We offer two kinds of APIs for developers. The Bot API allows you to easily create programs that use Telegram messages for…
TapTalk.io - TapTalk.io is a complete in-app chat SDK and messaging API - Easy integration and customizeable.
TDLib - Build your own Telegram
Applozic - Chat API & In-App Messaging SDK for Mobile & Web Apps Innovate fast, save development cost and delight users with a scalable, secure and customizable Chat
Google Duo - Google's answer to Facetime, high-quality video calling on iOS and Android.
Chat by Stream - Build and ship in app messaging in a few hours