From the article on this site The DOs and DON’Ts of Editing:
“You can’t create professional images without professional software. If you are serious about your craft you need to invest in the right tools for your trade. Would you take your film to Walmart to get processed instead of a custom lab? I’d hope not. Get yourself Adobe Photoshop (not Photoshop Elements, not Picasa, not Windows Photo Editor, not Gimp, etc.) and learn how to use it. Some people also use Lightroom in addition. You can sign up for Adobe’s Creative Cloud for an inexpensive monthly fee, and you can get a Lynda.com membership for cheap to learn your program thoroughly.”
Well, I guess the author of that article believes that the only software worth its salt for a professional is full Ps.