Capture One is a professional RAW file converter and image editing software specially designed for professional photographers, developed by Phase One from Denmark. It is mainly used for reading, organizing, editing, converting, printing and sharing RAW photos taken by digital cameras, and provides the best conversion quality and workflow to ease photographers' troubles bake at home. It is recognized as the standard among all RAW conversion software, and has been well received and trusted by users all over the world.

GIMP is the best free, open-source, and cross-platform alternative of Photoshop, which has become popular when first launched on Linux. GIMP Bible is currently the most comprehensive reference book for GIMP that you can find on the Internet. Its detailed instruction on how to get the most out of GIMP even goes beyond GIMP's official documentation.

Paint.NET is an image and photo processing software, it was developed and maintained by Rick Brewster when he was a Washington State University student, written in C# (C Sharp programming language), and was provided the project guidance from Microsoft later for locating in one early MS Paint free alternatives.