FastStone Image Viewer
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Full user review
"A must have!"
- Free alternative to ACDSEE.
- Fast, stable and with no bugs (I haven't noticed any).
- Excellent features (does exactly what it's supposed to do and not "a little bit of everything").
Possibly the best free picture viewer available.
The only thing that bothers me is that thumbnail sizes are predefined. However this is a matter of personal taste.