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WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS. WhatsApp Messenger is available for iPhone, BlackBerry, Android, Windows Phone and Nokia and yes, those phones can all message each other! Because WhatsApp Messenger uses the same internet data plan that you use for email and web browsing, there is no cost to message and stay in touch with your friends.

With Viber, everyone in the world can connect. Freely. More than 460 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over WiFi or 3G - for free. Viber Out can be used to make calls to non-Viber landlines and mobile numbers at low rates. Viber is available for many smartphones and platforms.

Facebook Messenger is a faster way to message. Reach friends right on their phones, get and send messages fast, message everyone at once and more.

Dasher lets you do more than just text message. It's messaging with benefits:

Handcent SMS is a free enhanced SMS and MMS application for Android.

The FASTEST Free Texting (SMS), Facebook Chat, Twitter, & Picture Messaging Application.

GO SMS PRO brings you cool UI, fast and convenient SMS/MMS experience. GO SMS Pro (yet FREE) is a huge enhancement for stock messaging app, much faster and more functions.

YAATA is influenced by the true spirit of Android. It is a SMS/MMS app that has so much to offer. You can personalize and configure this app to your definition of the perfect app. YAATA SMS is very powerful, reliable and the speed of the app is on another level. Even with all the exciting features this app has to offer the app size is under 3.9MB. This SMS app is highly user friendly and fulfils the wants and needs of the ultimate geek to a basic beginner user.