GIMP is arguably the closest it gets to an open source free alternative to Adobe Photoshop. With tons of features and image manipulation tools at your disposal (and the complexity that comes with it), GIMP is a powerful cross-platform desktop photo editing program. The latest version brings several GUI improvements, bug fixes and general enhancements. Full release notes and download links for Windows, macOS and Linux are here.
Unlike Windows and OS X, Linux allows you to fully customize not only the look and feel of your desktop, but also its functionality as well as settings, through different "desktop environments". Today we'll do a brief overview of the most popular Linux desktop environments to give you an idea about what each has to offer and what suits you the best.