arandr
ARandR is designed to provide a simple visual front end for XRandR. Relative monitor positions are shown graphically and can be changed in a drag-and-drop way.
lxrandr
LXRandR is the standard screen manager of LXDE. It manages screen resolution and external monitors. You can plug in another sc ...
driconf
DRIconf is a configuration applet for the Direct Rendering Infrastructure. It allows customizing performance and visual qualit ...
Xdiagnose
GUI tools for diagnosing, repairing, and failsafing X.org issues.