FLEXLoader is a iOS developer tool, it dynamically loads FLEX into iOS apps
on jailbroken devices. Configuration is via the FlexLoader menu in Settings.app
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About FLEX:
FLEX (Flipboard Explorer) is a set of in-app debugging and exploration tools for iOS development. When presented, FLEX shows a toolbar that lives in a window above your application. From this toolbar, you can view and modify nearly every piece of state in your running application.
For more info, see on Github and revealapp.com
It's open source at GitHub