Cutsom Select Home Random Poly normal Custom Shape VMAPS AxisCut Area / Perimeter Mirror Drill 2D Distance Others

Others selection Mode :
Concave selection mode will select concave polygons only
Non planar will select non planar polygons

Starting Shape for concave polygons detection
Activate the concave detection
Concave polygons are detected
Starting shape for non planar detection
the 2 squares on the right are a bit twisted
Activate non plananr selection
Result
the same option allready exist within Lightwave ;)