What program is like Photoshop but free?

Related questions

1. Is gimp an acronym?
2. Can gimp work with raw files?
3. Does gimp work with tablets?
4. Is there a free version of Photoshop for PC?
5. Can gimp open NEF files?
6. Which is easier Photoshop or Lightroom?
7. Can gimp open Nikon raw files?
8. Does gimp work offline?
9. What are the system requirements for gimp?
10. Is gimp free for commercial use?

Tags

1. #photoshop
2. #versions
3. #linux
4. #available
5. #donkey
6. #image
7. #windows
8. #manipulation
9. #program
10. #source
11. #today
12. #stands
13. #around
14. #years
15. #alternative