Alternatives to Ristretto
A simple, fast image viewer developed as part of the Xfce desktop environment for Linux. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Ristretto
A simple, fast image viewer developed as part of the Xfce desktop environment for Linux.
Replacements
Listings that take over the same core job as Ristretto.
Eye of GNOME
The classic GNOME image viewer, with a straightforward interface and support for plugins.
Eye of GNOME is the classic GNOME viewer with a straightforward interface and plugin support, also Linux only with little editing.
Xviewer
Linux Mint's simple image viewer, built on gdk-pixbuf and designed to work across desktops.
Xviewer is Linux Mint's GPL-2.0 viewer designed to work across desktops, handling large images with constant memory use and no real editing.
LXImage-Qt
A lightweight image viewer and screenshot tool from the LXQt desktop project.
LXImage-Qt is a lightweight Qt viewer from LXQt that adds an Exif panel, thumbnail bar, annotations and screenshots, plus multipage TIFF support.
Loupe
GNOME's default image viewer, with metadata display and quick crop, rotate and flip edits.
Loupe is GNOME's default viewer showing image metadata beside the picture and offering quick crop, rotate and flip edits, which Ristretto lacks.
Gwenview
KDE's image viewer for browsing collections of images, with simple editing and annotation tools.
Gwenview is KDE's viewer with basic crop, resize and red-eye edits and annotation tools, integrating best with Plasma rather than Xfce.
gThumb
An open-source image viewer and browser for the GNOME desktop on Linux.
gThumb is an open-source GNOME viewer and browser that works on local folders and suits sorting photos, going beyond a plain viewer.
feh
Lightweight, keyboard-driven image viewer for X11 that also sets wallpapers and lists image files.
feh is a MIT-licensed keyboard-driven viewer for X11 with slideshow, thumbnail and multiwindow modes and wallpaper setting, suited to tiling window managers.
nomacs
A fast image viewer that opens RAW and PSD files and can show the same picture in two synchronised windows.
nomacs is an open-source viewer for Windows, macOS and Linux that opens RAW and PSD files and adds a metadata panel and batch processing.
Similar software
Related functionality, not a direct replacement.