biteSMS - You love your iPhone as much as we do? You text all the time? Want more features?

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.

chompSMS - chompSMS is a communication app developed and published by Delicious for Android and iOS devices.

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

Twinme - Twinme – Private Messenger is a free, secure, instant, and high-definition messaging app that protects your privacy along with giving you full control over each of your relationships and contents.

Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.