There are lots of astronomy catalogs available on the internet that you can reformat and add to Stellarium's messier.fab file.
Here is one that you might enjoy:
I have observed the majority of these objects and they are truly magnificent.
After adding this catalog to Stellarium I was painfully aware that the plotted objects began to detract from the beauty of this program; particularly if you have your magnitude limit set high (i.e. mag 12) If you added the entire NGC catalog, the sky would be yellow from the plotted objects! So, in my opinion, I would use "add-on" catalogs sparingly and give the developers a break from asking for more catalogs. I could be wrong but I don't think adding the Hubble Guide Star Catalog to Stellarium was their intent! This is just my opinion...thanks for reading :)
Oklahoma City, OK, USA
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