ScreenshotMenu

Enjoy a quick and easy way to take screenshots from your menu bar. Just click the camera menu bar icon and choose one of the two options: 

1. Click Window – after selecting this option move the mouse over a window (it highlights) and click for a screenshot of the window including a beautiful drop shadow. It doesn’t matter if the window is obscured or partially off screen. 
2. Drag Area – draw a box for the area to be screenshot. 

With either option the screenshot will be saved to a high quality PNG file on your desktop, simple as that!

Available here for free