What are some alternatives?
StackPile - StackPile is a web-based app that helps you easily integrate third-party software into your existing or new website.
SendBird - SendBird is messaging-as-a-service.
Apache Tika - Apache Tika toolkit detects and extracts metadata and text from different file types.
Celery Project - Celery is an asynchronous task queue/job queue based on distributed message passing.
Twilio - Brings voice and messaging to your web and mobile applications.