Screen Shift
A simple app to change screen resolution, density and overscan of Android devices.
Uses the following adb commands before JellyBean 4.3:
am display-size
am display-density
From JellyBean 4.3 and up, this has been shifted to wm, with additional overscan option
wm size
wm density
wm overscan
Needs root in JB 4.3 and higher versions.
The app tries to follow material design principles. Go to the XDA thread linked above for screenshots and more info.
Find me in G+: Aravind Sagar