Physion is a 2D Physics simulation program. Since it is quite difficult to describe in a few words all of its features and abilities, please watch the following video to get an idea.
You can for example create circles, rectangles, polygons, gears, chains, ropes, balloons and lots of other physics items. You can also connect those items using springs, pulleys, nails etc.
This way you can create various scenes/scenarios which range from simple educational experiments to complex structures and mechanisms. Physion also supports scripting with Javascript.

Quick Start
1. Enter your GC login name and password in the top left into the text fields.
2. Press the 'Request gpx file' button.
3. Wait up to a few minutes (depending on the GC server traffic) until your gpx file import is complete (nickname should be displayed in green in the bottom left of the window).
4. If you wish add a home position to the list on the left (required for distance statistics). The date specify the first find date to be included in the calculation (you can add multiple homes if you move around a lot). If there is just one home please use a date in the past like 1999-12-31
5. Move on the the next page and activate the 'sections' you would like to see in your statistics output.
6. You can reorder these sections using drag & drop in the listbox.
7. Select a setion (not the checkbox itself) to see more options on the right half of the window.
8. Preview your statistic and if you like it press the upload button.

Requirements:
* Java

The license of this software is Freeware, you can free download and free use this graphing software.