GIMP

GIMP is the best free photo editing software. It has the kinds of image enhancement tools you find in premium software, and more are being added.

GIMP's interface should be familiar if you've ever used Photoshop – especially if you opt for single-window mode, which brings up all the toolbars and canvases in an Adobe-style layout.The set of photo editing tools is attractive and has layers, masks, curves, levels…

You can remove holes easily with amazing clone stamp and healing tools, create custom brushes, apply Perspective changes, apply changes to isolated areas with smart selection tools.

GIMP is an open source free photo editor, the community of users and developers has created a huge collection of plugins to extend its utility even further. Many plugins come pre-installed, or you can download more at Official Glossary. You can even install Photoshop plugins into this software.

Pros:

• Advanced options
• Photoshop-like interface
• No ads or usage limits
  

Cons:

• The curve tool is not convenient

Website: https://www.gimp.org/