Shotwell
Shotwell supports JPEG, PNG, TIFF, BMP, GIF, WebP and RAW photo files. Shotwell's RAW format support is currently limited. When you view a RAW photo, you are actually viewing a JPEG derived from the RAW photo, not the RAW image itself. Additionally, the RAW editing pipeline is not fully 16-bit - you can only export edited photos as 8-bit files. Most supported formats can be used for export (JPEG, PNG, TIFF, BMP). The Basic Information pane appears at the bottom of the sidebar, and displays a brief summary of the photos you've selected. If no photos are selected, it displays a summary of the entire collection. You can toggle the display of this pane using the information command. The map pane appears at the bottom of the sidebar as part of the basic Information pane, and displays an overview map the photos you've selected. If no photos are selected, it displays an overview of the entire collection.
Learn more
nomacs
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. nomacs features semi-transparent widgets that display additional information such as thumbnails, metadata or histogram. It is able to browse images in zip or MS Office files which can be extracted to a directory. Metadata stored with the image can be displayed and you can add notes to images. A thumbnail preview of the current folder is included as well as a file explorer panel which allows switching between folders. Within a directory, you can apply a file filter, so that only images are displayed whose filenames have a certain string or match a regular expression. Activating the cache allows for instantly switching between images.
Learn more
PhotoViewerPro
True full-screen viewer with photo zoom support. Customizable image magnifier. Powerful image editing tools. Resize/resample, rotate/flip, crop, sharpen/blur, adjust lighting/colors/curves/levels, etc. Eleven re-sampling algorithms to choose from when resizing images. Image color effects, grayscale, sepia, negative, red/green/blue adjustment Image special effects. Annotation, drop shadow, framing, bump map, sketch, oil painting, lens. Draw texts, lines, highlights, rectangles, ovals, and callout objects on images. Clone stamp and healing brush. Superior red-eye effect removal/reduction with a completely natural-looking end result. Multi-level undo/redo capability. One-touch best fit/actual size image display support. Image management, including tagging capability, with drag-and-drop and copy-to/move-to folder support. Histogram display with a color counter feature. Compare images side-by-side (up to 4 at a time) to easily cull those forgettable shots. Image EXIF metadata support.
Learn more
Vieas
Vieas is an image viewer and converter with a combination of two window forms. Image Preview is useful for editing and saving. It can be downloaded from the software page. Susie plug-ins are available to load other files or to extract from other archives. Open dialog box, file associations, send to menu, drag, and drop. Zooming, fullscreen, slideshow, always on top, histogram, image information, Png textual data, EXIF data. Crop, resize, expand the canvas, rotary, mirror, flip, equalize, correct (histogram/gamma/brightness/contrast/highlight/shadow/color balance/hue/saturation), and replace color. Negative, unsharp mask, blur, soft focus, denoise, effects (color filter/mosaic/diffuse/emboss/edge detection/posterization/oil painting). Print, set wallpaper, count colors, copy/paste/delete files, and launch the external tool. Key customization and multiple monitor support. Compression level, filter, interlace, gamma, transparent color, etc.
Learn more