Empower Threaded SMS - Finally, True Threaded SMS on BlackBerry. Now instead of just a simple list, your SMS are sorted into conversation and grouped by Contacts. Just like the iPhone SMS, you can view each conversation in IM style and reply like SMS chat
Empower InstaSpell identifies mis-spelt words the moment you type them. And spellchecks not your only Email, but also SMS, Notes, Tasks, Memo, Calendar, Contacts, and IM. And a number of third party apps including GTalk & Yahoo messenger
SendIt - Are you always typing the same sms message and wish you can just select a pre-defined message and send it? Now you can with SendIt. A simple and intuitive way sending sms from the Address Book, Call Log and Messages application.
Sending a sms is way easier with SendIt
catchit has been designed to help you catch those badly-timed calls when you don't have to leave your caller hanging and you also don't want to interrupt the "now".
When activated, if you choose to ignore an incoming call, a screen will present you with an option to send a pre-populated text back to the caller immediately
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
Advanced Forwarder is a useful utility for BlackBerry allowing you to forward your incoming calls and SMS messages to another mobile number. The forwarding can be instantly enabled or disabled at your convenience, both locally from the application interface or remotely with an SMS command sent from another mobile phone
NotNow allows you ignore the incoming call and send a friendly SMS message to the caller.
There are times that you can not answer the call such as in a meeting, at the movie, driving or just busy. You can simply press the Ignore button and then select a pre-defined message to send to the caller.
New Do Not Disturb advanced feature to ignore all incoming calls
SMSCounter lets you count all incoming and outgoing SMS messages. You can setup a monthly billing cycle. Assign SMS monthly limit. Get warning when the monthly limit is about to go over. Save monthly billing report to the Calendar.
Note: It may not be compatible with other 3rd party SMS applications
peoplesound - Free mobile instant messaging, chatting, SMS notifications and the ability to share photos, links, and news instantly with your real friends! peoplesound was previously called bing