If you are looking to download software for geometry, you have several powerful options depending on whether you need a dynamic construction tool, a 3D modeling app, or a simple calculator.

GeoGebra is the most widely used free, open-source software for teaching and learning mathematics at all levels.

Perform transformations like mirroring, rotating, and dilating.

Geometria is a free application specifically designed for creating and solving problems in (3D). GeoGebra Calculators and Apps - Free Downloads