UCGO was released today after almost 6 month of development. I wish you a lot of pleasure using it and making addon for it. Don't forget to READ the doc and the FAQ (see doc)
You can find UCGO addon here: http://orbiter.dansteph.com/index.php?disp=d
Here some videos that were released during development, they show some aspect of UCGO.
Youtube video showing the Arrow Freighter:
(German users can access the videos directly here: (hi-res)http://orbiter.dansteph.com/video/ (thanks GEMA))