1. RetaineddatetimepickersAndroid Library to help you with your date & time pickers while retaining the instance of the pickers on orientation change.
3. KamKAM is an apk manager, backup, restore and more.
4. FasthubFastHub the ultimate GitHub client for Android.
5. FastaccessA tiny launcher or as Samsung likes to call it Floating Toolbox.
6. AndroidFloatingImagethis example explains how to code a floating imageView on top of your apps and with the ability to move it around the screen.