I have created a personal library of Geometer's Sketch Pad scripts as tools for doing constructions. These scripts allow me to make constructions in an efficient way as I use them to perform demonstrations for student groups at our high school as we pursue discoveries of Euclidean Geometry using GSP as a tool.
Here is my list of scripts that I have found worth saving. Remember to open Geometer's Sketch Pad before trying to use the scripts.
Equilateral Triangle, given side
Isosceles Triangle given the Base
Orhocenter, Midsegment Triangle
Constructing Perpendicular Bisectors
Constructing Perpendicular Lines