Handcent - Handcent – Free Messenger for Texting and MMS is the most customizable, powerful, and next-generation messenger app that makes user-experience more enjoyable and convenient.
Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...
Reach - Mass messaging app for the iPhone
Burn Note - Burn Note is the name of a continuous private messaging utilizing which you can have an ongoing private discussion with your companions or any individual who is at Burn Note.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Snapchat - Real-time picture chatting