QSMS - With QSMS installed just Press 'Q' to Compose SMS, or use the shortcut icon
Just like you can hit ‘C’ to compose an email, you can use the ‘Q’ shortcut to compose an SMS!
To enable shortcut, please disable “Dial from home screen” option through Phone > Options
Nimbuzz for Blackberry gives you free instant messaging and puts all your friends in one place!
For the first time on BlackBerry, you can chat with your friends on Skype, Facebook & MySpace using Nimbuzz for BlackBerry or IM your friends across all your other social networks
Trillian helps you organize and stay in touch with your IM and social friends while on-the-go. Receive instant push notifications, send pictures and messages, and optionally synchronize with Trillian for Mac, Windows, iPhone and Web
Pinger (BlackBerry) - Pinger lets you trade voice messages with anyone's mobile phone in over 20 countries. It's better than voicemail because there's no ringing or lengthy instructions. It's more personal than text because it's your own voice so there's no room to be misunderstood. Plus you can send a Pinger message to a group of people with just one call
Papaya - turns your phonebook into a fun and useful social network! It allows you to communicate with your friends cheaply and easily, no matter where you are. Using Papaya, you can play games with your friends, chat with them over IM, share pictures and other files, make cheap international calls, and more
SPYPhone GOLD Internet Edition is software that you install on a mobile phone. After installation, SPYPhone secretly records events that happen on the phone and delivers this information to a web account, where you can view these reports 24×7 from any Internet enabled computer or mobile phone
DriveSafe.ly automatically reads incoming text messages and emails out loud so you can concentrate on the road. Eliminate the temptation to reach for your phone by letting DriveSafe.ly read to you and optionally auto-respond for you.
Stay connected by listening to your messages without texting while driving or reading emails in your car. DriveSafe
iSMS - It's not very convenient to send a new SMS. iSMS sets a shortcut key for new SMS so that you can press i on the keyboard and send new SMS as fast as you can