Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
Fake Call and Sms - Fake Call and Sms app is a fake message sender and caller app that provides features through which you can receive as well as can send simulated messages to desired contacts.
GetChat.App - Add WhatsApp chat to your website for free
WhatsFake - Make fake conversations that look just like WhatsApp
Avochato - Text messaging for your business.
SMS Class Tools - SMS Class Tools is a fake message generator that allows you to have some fun with your colleagues and friends.