Facebook Messenger
Description: Facebook Messenger is a popular messaging app developed by Facebook. It allows users to send messages, photos, videos, and make voice and video calls to contacts. Key features include group chats, games, payments and using bots.
Type: software
Pricing: Free
Google+ Hangouts API
Description: The Google+ Hangouts API allows developers to enable real-time communication features in their apps. It supports video calling, screen sharing, and other collaboration tools. The API makes it easy to build messaging, meeting, and conferencing functionality.
Type: software