GIMP is great! No, this isn't a paid ad for the software (see my disclosure policy) - the software is free. If you are looking to edit family pictures or do something more professional, this tool is amazing :)
The link to GIMP (GNU Image Manipulation Program) above brings you to my review of the photo editor. I'm working on a whole new review right now. Head to the sidebar and subscribe, you wouldn't want to miss it, right?