Best Screenshot Software Hands-Down Primary tabs

If you find yourself sending a lot of screenshots to clients or colleagues, I can't recommend enough the program "Greenshot".  It's free and open source, and allows you to very quickly and easily capture just regions of your screen, certain windows, etc.

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You can then either save your screenshot directly, or edit it in a basic image editor which lets you draw arrows, rectangles, and even blur regions-- very handy if you are sending sensitive information.

I have a keyboard shortcut set for "capture region", so when I press that key, I can immediately draw a rectangle around whatever I need to capture.  Very handy.  You can then immediately send it through email if you want, or send it to a number of online services.

Here's an example of an output screenshot you might create in about 10 seconds: