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Great Circle – from MathWorld Great Circle description, figures, and equations. Mathworld, Wolfram Research, Inc. c1999

The Great Circle Mapper Displays Great Circle flight routes on a map and calculates distance and duration

Great Circle Mapper Interactive tool for plotting great circle routes.

Great Circle Calculator  deriving (initial) course and distance between two points.

Great Circle Distance Graphical tool for drawing great circles over maps. Also shows distance and azimuth in a table.

Great Circles on Mercator's Chart by John Snyder with additional contributions by Jeff Bryant, Pratik Desai, and Carl Woll, Wolfram Demonstrations Project.

3D First Problem  3D javascript interactive tool (Google Chrome, Firefox, Safari (web browser)).

3D Second Problem  3D javascript interactive tool (Google Chrome, Firefox, Safari (web browser)).