M17 from the ESA educational archive
This is a really worthwhile and enjoyable plug-in. My first attempt, with M31 was not so successful due to problems with registration. I'm much happier with this attempt at M17 and plan to try my hand a few images out of various archives. The documentation on the site for installing and using the plug-in is also first rate.
This fits liberator image is not available for sale.
Cliff Newman & the ESA/ESO/NASA Photoshop FITS Liberator