PDFill PDF Editor
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Full user review
"Works well, relatively intuitive"
It is very useful for filling in PDF forms and is fairly intuitive to use once you get the hang of it.
The watermark is a bummer, but that's the price of 'freeware'. It can be difficult to line up inserts, and once you have completed a field you can't edit it.
As 'freeware' goes, GO FOR IT.