Dialogflow - Conversational UX Platform. (ex API.ai)

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.

Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Fake Text Message-Prank text app - Fake Text Message-Prank text app allows users to take screenshots of text messages from their favorite celebrities so they can share them on various social media platforms in order to prank other users.

Botkit - Botkit is an open source developer tool for building chat bots, apps and custom integrations for major messaging platforms.

iPhoneFakeText - iPhoneFakeText is one of the best and most powerful tools for writing long & funny texts for iPhone devices.