OSG Exporter
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http://projects.blender.org/projects/osgexport/


Cal3D Exporter
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discussion forums => http://www.blender3d.org/cms/Help_Forums.192.0.html

this is where I got the exporter from;
http://www.blender.org/forum/viewtopic.php?t=7884&postdays=0&postorder=asc&highlight=blender2cal3d&start=45
(page no4, last post....)