GIMP
GIMP is a cross-platform image editing solution which focuses on professional photo editing features. These features allow users to edit images and create new artworks from scratch. The software provides basic image editing features such as color and gradients adjustment, cropping, enhancing or reducing image quality and many more. You also get advanced features such as layering masks, Bezier curves, filters etc. The graphical user interface of this software is built  with a high-end graphics program which drives user performance to the next level. The main editing window looks pretty similar to Photoshop, so those comfortable with Photoshop will at ease. 
Why you must get it ?
Even though this application is completely free, it doesn't compromise on its performance and features. It doesn't take too much memory on your computer as well. There are multiple photo editing apps and software available on the market but this software mainly concentrates on advanced features. GIMP is a user-friendly software which includes most of the sophisticated tools that attract graphic designers, photographers, and illustrators. As it's an open- source software, it allows anyone to edit or modify the core code and include new plugins, which don't need any kind of approval from the main development team. The software is available to download from the Microsoft Store.