The freebie is an update (iOS 7 UI kit to iOS 8 ). It includes system screens, navigation controls,date pickers; and iOS 8′s design, lists and lots of others.
This free iOS 8 UI kit  was designed byOz Pinhas
Tags: ui,ios,,lock screen,navbar,notification center,settings,tabbar,ios 8,notification
Format: PSD;
Size:14.9 MB;
License info: according to the author,it’s free for any use.but  you can’t claim they are yours ,can’t sell them. You’ll know more details if you download the psd pack and read the readme text file.
You can download this  iOS 8 UI kit  free psd file from here