Geogebra

Geobebra is a powerful free dynamic geometry tool that is similar to Geometer’s Sketchpad, but offers additional tools including a computer algebra system (CAS) and spreadsheets. Users can graph equations (with sliders for parameters if desired), plot data, explore and model geometric concepts, and more. Users can access a wealth of pre-built shared lessons via GeoGebra Tube. Tutorials, help documents, and how-to documents can be accessed from their help wiki. Users can save their work as a file on their computer or save to their Google Drive. Geogebra is available as a Google Drive App as well so that Geogebra files can be opened directly from Google Drive or Geogebra can be launched from Google Chrome Browser.

Here are a few sample files that I have created that you can explore, or try creating your own!