Gymkhanas for LibreGeoSocial is is a free/open source plugin to do Gymkhanas in the LibreGeoSocial project (a mobile social network with a Mobile Augmented Reality interface. More Info: http://libregeosocial.morfeo-project.org/)
You can browse in the repository in http://gymkhana.svn.sourceforge.net/viewvc/gymkhana/
Or also obtain instructions to download the source code here
You can obtain support for this project in the web page https://sourceforge.net/projects/gymkhana/support