Software Type: Imagen editor
License: Public, Free and Free Software. GPLv3
Payment alternative: Adobe Photoshop
Release date: 15 February 1996
Developed by: The GIMP Development Team
What is GIMP?
GIMP is an application or image editing software for a bitmap in pixels, it is free software and open source, that is, you can make modifications and see how it is programmed, you can do things at the level of Adobe Photoshop since it is its alternative payment.
Download GIMP for Linux
Debian and derivatives. Ubuntu, Linux Mint
Add the repository and
1) sudo add-apt-repository ppa: otto-kesselgulasch / gimp
2) sudo apt-get update
3) sudo apt-get install gimp