Wikipedia
MobileNotifier is a free open-source alert messaging system, written by Peter Hajas, for jailbroken iOS devices including iPhone, iPod touch, and iPad, for iOS 4.0 and above that. Mobile Notifier was written as a reproduction of Android notifications. It is currently released under the BSD License. The lead developer, Peter Hajas, left to work for Apple but the project continues on.
The software hooks into the operating system to replace the built-in modal notification user interface, and maintains a queue of unread messages for the user.
As of late May 2011, MobileNotifier has had over 230,000 downloads.
MobileNotifier was developed in conjunction with the Rensselaer Center for Open Source Software at Rensselaer Polytechnic Institute.