gimmage is described as 'Gimmage is a small gtk image viewer, perfect for command line usage as it accepts directories and image filenames as arguments. It also has a filechooser integrated into the main UI, making accessing images and directories a snap' and is an app in the Photos & Graphics category. There are more than 10 alternatives to gimmage for a variety of platforms, including Linux, Windows, Mac, Xfce and KDE. The best alternative is nomacs, which is both free and Open Source. Other great apps like gimmage are XnView MP (Free Personal), qView (Free, Open Source), gThumb (Free, Open Source) and Gwenview (Free, Open Source).
nomacs is a small, fast image viewer able to handle the most common image formats including RAW images. Additionally it is possible to synchronize multiple viewers. A synchronization of viewers running on the same computer or via LAN is possible.
gThumb is an image viewer and browser for the GNOME Desktop. Features Image Viewer * View single images (including GIF animations). Supported image types are: BMP, JPEG, GIF, PNG, TIFF, ICO, XPM. * View EXIF data attached to JPEG images.
Eye of GNOME is the official image viewer for the GNOME Desktop environment. With it, you can view single image files, as well as large image collections. The Eye of GNOME supports a variety of image file formats.
Xee is an streamlined and convenient image viewer and browser. It is similar to macOS's Preview.app, but lets you easily browse the entire contents of folders and archives, move and copy image files quickly, and supports many more image formats.