FastStone Image Viewer
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Full user review
"This is fast and effective"
I like how fast this is. Everything is easy to access and not too cumbersome to figure out.
It's a smaller program so there are many things it doesn't do, if you're trying to really alter an image.
I use the program almost everyday. Grabbing screen images and then making notes on them so I can explain something to someone. I love it and have sent these guys a donation in appreciation for the value I've received.