Mirmir is a fairly new tweak that’s available on iOS 8.4 it allows multitasking on a truly fantastic scale, it works amazingly on the iPhone 6 and 6+ but it’s works unbelievably well on the iPhone 5. 

  
A handy feature is the ability to put your screens in both landscape and portrait mode and also the ability to resize them to your preference. Tou activate the tweak by sliding down on the left side of the screen then tap and hold the grey header to move around the screen and tap again to be able to picnics and zoom and change between Landscape and Portrait mode. 

The tweak itself costs just $3.99 and is worth every penny. You can purchase this tweak from the BigBoss repo.