The best Image Viewer alternative to Picasa is digiKam, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Picasa and many of them are Image Viewers so hopefully you can find a suitable replacement. Other interesting Image Viewer alternatives to Picasa are FastStone Image Viewer, Ente Photos, ImageGlass and Fossify Gallery.
digiKam is an advanced digital photo management tool that simplifies importing and organizing photos into albums. It supports various formats including RAW, features tagging, metadata management, duplicate finder, photo editing, sharing, GPS data handling, and has cross-platform compatibility.
Fast image browser and editor for Windows with robust support for browsing, editing, and conversion. Features red-eye removal, resizing, enhanced EXIF access, and musical slideshows with over 150 effects.
Open-source, end-to-end encrypted backup and sharing for photos and videos, multi-platform sync, original quality preservation, privacy-first design, collaborative albums, family sharing, secure external sharing, robust data replication, and device imports.
A feature-rich, simple-to-use app seamlessly integrated with a clean, minimal and modern user interface.
Privacy-focused offline gallery offers photo and video management, editing tools, secure locking by pin or fingerprint, EXIF metadata removal, recycle bin support for recovery, universal format compatibility, customizable material design themes, and no ads or trackers.
nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.
Shotwell is an open source photo organizer designed for the GNOME desktop environment.
Multi-format solution for managing, searching, and organizing images, videos, audio, and fonts with advanced tags, folders, smart folders, color filters, and over 90 design file previews. Features browser integration, annotations, and creative workflow support.
Offers organization, viewing, and editing tools for digital images, supports over 700 RAW formats, enables metadata embedding and syncing, dynamic category and keyword filters, workflow optimizations, non-destructive edits, detailed image preview, and sharing options.
Photos is a digital photograph manipulation application developed by Apple, intended to be less complex than its predecessor iPhoto .
gThumb is an image viewer and browser for the GNOME Desktop. It also includes an importer tool for transferring photos from cameras.
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Great photo and tag management tools. It's also apparently the only program, from the ones listed, that has facial recognition features (although not great in comparison to Picasa's).