PieMessage - iMessage on Android
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Big Ass Message - The most useful single-serving site on the World Wide Web.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
AirMessage - Use iMessage on any Android phone 💬
Facebook Messenger - Facebook Messenger is a faster way to message.