XnView MP is the enhanced version of XnView Classic. It is a powerful cross-platform media browser, viewer and converter. Developed by Pierre-Emmanuel Gougelet
License: Free Personal
gThumb is a lightweight image viewer and organizer primarily aimed at users needing basic functionality, particularly well-suited for the GNOME environment. In contrast, XnView MP offers a comprehensive set of tools for image management and editing, appealing to more advanced users who require extensive organization, editing features, and cross-platform compatibility.