Windows only: If you're looking for an all-in-one image capture tool that offers more than just capturing, look no further than PicPick.
With a built-in image editor (similar to but more feature-rich than Microsoft Paint), a colour picker, a colour palette (which offers outputs in HTML, C++, RGB, and Delphi), a magnifier, a pixel ruler, a protractor, a crosshair option and a whiteboard, PicPick covers common designing/editing needs without slowing down your system.
Offering support for four image formats and five output options (including the option to open the capture in your editing program of choice), along with multiple capturing options, PicPick is customisable to your needs.
While our resident favourite Snagit takes the cake as the best screen capture tool, those of you looking for a good, all-in-one, portable capturing app should take a gander at what PicPick has to offer. PicPick is a free download for Windows users only. Thanks Art!