Non-destructive editing is the standard way of working for many professionals, which means Gimp can't be fully considered a true alternative to proprietary image editing software, that have clever features for this. The feature set covers a huge range of professional applications, however the lack of adjustment layers makes non-destructive editing hardly possible. Gimp works with all the important image formats, and opens PSD files (with some limitations). Gimp is designed for similar uses like Adobe Photoshop and Affinity Photo. It's also legendary because of it's fundation, the GTK toolkit became a base of many other GUI applications, including GNOME. Gimp, an open-source image editing app has been around for long on Linux.

Version 1.2 added Pages though, so that this important feature is no longer missing. For many years, because of SVG's limitations Inkscape didn't support multi-page documents (or artboards), which was a major drawback. Some users find its UI less intuitive than proprietary competitors', but with some initial learning, especially by getting used to keybindings, it's very efficient.

Scribus open indesign files