So you’re thinking about jailbreaking iOS 9, but you’re not sure what you’d actually be able to do with a jailbroken device? Well, if you have an older iPhone, iPad, or iPod touch that might not support all of the new features in iOS 9, you can install third-party apps to enable some of those features.
Developers have already figured out how to bring support for 3D Touch-style context menus to devices that don’t have force touch displays and multi-window support to devices that don’t officially support the feature.

One of the things you can do with the 3D Touch display on the iPhone 6s and iPhone 6s Plus is use a hard press to open up a sort of context menu on app icons. While no software will give pressure-sensitivity to older iPhones, you can install a third-party app called Forcy that lets you access the same context menus by swiping up on an app icon.
This can let you access menu items to snap a photo in the camera app, view your reading list or bookmarks in Safari, and more. Not all apps are supported, but Forcy should work with most Apple apps including Phone, Messages, Mail, Calendar, and Camera.
Forcy is available from the Cydia store.
Apple also introduced a series of multi-screen features to iOS 9, including SplitView (for seeing two apps on a screen at the same time), SlideOver (for quickly sliding one app over another to perform simple actions without closing the first), and Picture-in-Picture (for watching videos in a small window while another app is running).
But some of those features are only available on the latest iPads. Want to enable them on older devices… or on iPhones? Medusa is a Cydia app that will let you do that.
It’s worth noting that Apple didn’t offer these features for older devices because they might not really have the hardware to offer decent performance, so don’t be surprised if your first-gen iPad mini starts to feel sluggish when running apps in SplitView.
via Funky Space Monkey and Redmond Pie