Zoner Photo Studio is a bitmap editor and image file manager is one of the most widely used programs for editing digital photographs. Developed by Zoner Software
License: Commercial
gThumb is a lightweight, open-source image viewer and basic editor primarily for Linux, making it suitable for casual users. In contrast, Zoner Photo Studio offers a comprehensive suite of advanced editing and organizational tools, making it better suited for professional use, albeit with a higher cost and Windows exclusivity.