Export plugin for anim8or, allows you to select "Orbiter mesh" as export format, when exporting a object. Only known limitation is that this script does only support single-material meshes.
If the output does have any bugs, please feel free to report them in the Orbiter Forum Thread
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Please do also report it, if the colors of the object in anim8or and in orbiter have severe differences. Both use different lighting models, but i would prefer "What you see is what you get."
061209: Write compatible material names, write exporter version hint.
071205: Fixed duplicated mesh groups when materials of the same name appear in both global and local material lists.