ImageGlass!

nomacs is a free image viewer for windows, linux, and mac systems, which is licensed under the GNU Public License v3. nomacs is small, fast and 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. It allows to compare images and spot the differences (e.g. schemes of architects to show the progress).

JPEGView is a small and fast viewer/editor for JPEG, BMP, PNG, GIF and TIFF images. On-the-fly image processing is provided - allowing to adjust typical parameters as sharpness, color balance, contrast and local under-/overexposure.

You can use the Photos app to view or edit photos and videos in your Pictures library and on OneDrive, and to import photos and videos. The Photos app includes a wide range of editing options to enhance your photos, from automatic fixes to advanced adjustments. After you've finished editing your photos and videos, you can then share them with friends and family without leaving the app.

Xee is a lightweight, fast and convenient image viewer and browser. It is designed to be a serious tool for image viewing and management, with a sleek and powerful interface.

Core Features

Maverick Photo Viewer is a lightweight & fast photo/picture viewer for Windows. It can easily replace Windows Photo Viewer by integrating itself with Windows Shell. You can browse the picture files easily, convert pictures into differrent formats (36 formats are supported), Do basic image operations like rotation, brightness/gamma/contrast adjustment, grayscale, resize etc. Default keyboard shortcuts are the same as good old ACD See ones and fully configurable. You can display EXIF/meta data, set the pictures as wallpaper with one keystroke or click, create a favicon from any given picture. »

This is a lightweight image viewer with basic image processing.

ViewPic is a lightning fast and image viewer, you can quickly browse through all images in a folder.