Astrometry

Astrometry for OS X is a native port of the astrometry.net system, a web service server, and a GUI wrapper.

It is tightly coupled with AstroImager and its image-solving feature, but you can use it as a standalone application as well. The astrometry engine is based on astrometry.net 0.65 and cfitsio 3.39. It doesn't use any python scripts or 3rd party image conversion programs, so it accepts only FITS files and doesn't produce any plots.