CometChat - Seamless Real-Time Chat Integration for Your Applications.
TapTalk.io - TapTalk.io is a complete in-app chat SDK and messaging API - Easy integration and customizeable.
HappyFox Chat - HappyFox Chat is a live chat software for the websites.
Lets Chat - Open source self-hosted chat app for small teams
Taskworld - Taskworld is a cloud-based collaboration platform that increases productivity, engagement at work.
WeChat API - WeChat API and SDK allow developers to access and integrate the functionality of WeChat with other applications.