Geometer Sketch pad has a way to save constructions that you will use regularly.
I have created tools to construct:
the centroid of a triangle, the orthocenter of a triangle
the circumenter of a triangle, the circumcircle of a triangle
the Incenter of a triangle, the Incircle of a triangle
the Medial triangle, the orthocenter, midsegment triangle
the orthic triangle, the pedal triangle
the center of the 9pt circle, the 9pt circle
the trisection of a line, an equlilateral triangle given a side
a square, given a side, the centers of a triangle
the centers of the triangle with the Euler line
The golden ratio, a pentagon given the radius
a hexagon given the side, an octagon given a side