Here are some GSP tools I have created.

Centroid

Orthocenter

Incenter

Incircle

Circumcenter

Circumcircle

Triangle Centers

Euler Line

Triangle Medians

Nine-Point Circle

Center of Nine-Point Circle

Medial Triangle

Orthic Triangle

Orthocenter, Mid-Segment Triangle

Pedal Triangle

Equilateral Triangle - given a side

Isosceles Triangle - given base and altitude

Square - given a side

Hexagon - given a side

Octagon - given a side

Golden Rectangle

Trisection of a Line Segment

Circle Tangent to Two Circles - version 1

Circle Tangent to Two Circles - version 2

Circle Tangent to Two Circles - version 3

Circle Tangent to Two Circles - version 4

Circle Tangent to Two Circles - version 5

Circles Tangent to Two Circles - version 6 - draws both tangent circles

Tangents to Two Circles

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