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XnView is a great image viewer.

Supports viewing, converting, screen capture, slideshow and TWAIN (scanning).

Read more about all the features of XnView.
The Zip file available for download is portable.

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FastStone Image Viewer is a freeware image viewer with plenty of options and features.

It’s fast and uses few resources. You can download a portable version.

For a more complete image viewer, try XnView, which is also free.

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FuturixImager is a freeware replacement for Windows Image Viewer.

It has a basic image editor and can scan and print images. It supports many file types, including RAW.

It is not a full featured image viewer like XnView but you can use it instead of the default image viewer that comes with Windows.

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PhotoScape is by far the most feature-rich free application when it comes to doing work with images, except for Paint.NET which is a professional-grade free editor.

The interface can be better because it feels a little disorganized but in the end, it is a great program for working with images.

Being free adds more value to it.
Features:

• Viewer: View your folders photos, slideshow
• Editor: resizing, brightness and color adjustment, white balance, backlight correction, frames, balloons, mosaic mode, adding text, drawing pictures, cropping, filters, red eye removal, blooming
• Batch editor: Batch editing multiple photos
• Page: Make one photo by merging multiple photos at the page frame
• Combine: Make one photo by attaching multiple photos vertically or horizontally
• Animated GIF: Make one animation photo with multiple photos
• Print: Print portrait shot, carte de visite, passport photo
• Splitter: Divide a photo into multiple parts
• Screen Capture: Capture your screenshot and save it
• Color Picker: Zoom in screen on images, search and pick the color
• Rename: Change photo file names in batch mode
• Raw Converter: Convert RAW to JPG

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