Thumbsplus is a great image management software.
Check it out.
I know that there are some free alternatives. But some of the free ones do not cater for certain formats that Thumbsplus 7.0 have.
And if you like to annotate your images to make it easier to retrieve by keywords, Thumbsplus is really good here. Not much point collecting images when you have great difficulty looking for the one you need amongst the thousands that you accumulate.
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