Gimp is an open source, professional photo and image editor similar to Adobe Photoshop. It is 100% free and can be downloaded here:
https://www.gimp.org/downloads/

Check out these other videos for step by step instructions on how to Download and Install:

Install on Windows:
   • GIMP | Download and Install on Window...  

Install on Linux:
   • GIMP | Download and Install on Linux ...  

Find more great free software at http://tjfree.com/