ProSwitcher is described as 'A addon to Backgrounder , ProSwitcher gives your jailbroken iPhone Palm-Pre style multitasking' and is an app. There are 2 alternatives to ProSwitcher for iPhone, Backgrounder and iPad. The best ProSwitcher alternative is Multifl0w. It's not free, so if you're looking for a free alternative, you could try Circuitous.
Multifl0w is a multitasking interface for Backgrounder which displays applications that are running and allows you to scroll left and right between them for quick switching. It also includes a snapshot of each of the backgrounded applications.
A front-end addon for Backgrounder, Circuitous provides a clean interface for switching between apps and multitasking on your jailbroken iPhone. It shows your open applications in a nice dock on the right side of the screen from which you can launch and exit apps.
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