Here is a list of some tools that I created on Geometer's Sketchpad version 5:
Circumcenter and Circumcircle of a Triangle
Divide a Line Segment into the Golden Ratio
Equilateral Triangle Given a side
Incenter and Incircle of a Triangle
Nine Point Circle of a Triangle
Pedal Triangle of a Triangle and Pedal Point
Regular Decagon Given a Radius
Regular Dodecagon Given a Side
Regular Pentagon Given a Radius
Tangent Circles of Two Circles and a Point of Tangency