PicPick is a free software to take the screenshots of your desktop and all your applications. It is very useful for all designers and screenshot lovers. The important feature of this application is its portability; you don’t need to install it. You can keep it in your flash drive as well to run it anytime and anywhere.

Features

• Captures
  - Full Screen (Support for Dual Monitors)
  - Active Window
  - Window Control (Scroll a page automatically)
  - Region, Fixed Region
  - FreeHand
  - Repeat Last Capture
• Image Editor
  - It’s very similar to Microsoft Paint, but you can do more.
  - It provides an effect like selection opacity, blur, sharpen, brightness, contrast, hue, saturation, flip, rotate and etc.
• Color Picker
• Color Palette
• Magnifier
• Pixel Ruler
• Protractor
• Crosshair
• Whiteboard

Go to here to free download.