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Pro Free and open source
Pro Can capture an entire webpage
Instead of just capturing the visible portion of the page, this tool can capture all of the page in one image by scrolling through the page, taking images at set points and then stitching the images together.
Pro Allows annotating, highlighting and obfuscating screenshots
Pro Can be quickly invoked with the print screen button
Pressing the print screen button will allow you to select the captured area.