Oh yeah! Another release of GIMP – The GNU Image Manipulation Program verion 2.8.4, an opensource image editing application that supports major operating systems like Linux, Windows, Mac OS X, Sun OpenSolaris, and FreeBSD. This version has lots of bugs fixed, see the note.
For new users, plugins can be found from its official website and you can even write your own plugin to share with other users.
Release note here.
Installation for Ubuntu/Debian below, for other unix-like OS refer installation from its download page.
sudo apt-get update && sudo apt-get install gimp
# installing from ppa sudo add-apt-repository ppa:otto-kesselgulasch/gimp
sudo apt-get update
sudo apt-get install gimp
# additional sudo apt-get install gimp-plugin-registry gmic