GIMP, which stands for GNU Image Manipulation Program is a popular and completely free photo editing software that's similar to Adobe Photoshop and Affinity Photo 2. As you'd expect, being free and open source, is that it's severely limited in comparison, but it does provide features and functionality that allow you to make a variety of adjustments to your photos.
It's not one of the best photo editing software programs available, but that's not to say that GIMP isn’t a useable photo editing program thanks to features including Layers, Layer Masks, lots of useful adjustments, cloning and healing tools, painting tools, and filters. To be fair, what you do get in terms of features is impressive considering it's free software.
