[UPDATE] FastStone Capture 8.4 (Paid app)

The best (IMO) screen capture program for Windows. Several new features and enhancements. I really like the new Screen Focus!
I've been using it daily at home and work since 2007. (I have no connection to FS Capture. Just think it's the best for the $$ of everything out there. Lifetime upgrades for a one time purchase.)

http://www.faststone.org/FSCaptureDetail.htm

Version 8.4 (January 14, 2016)
*Added support for high-DPI/high-resolution/4K monitors
*Added a tool called Screen Focus, which helps you stay focused on the task under the mouse pointer by dimming the rest of the screen
*Added an option to show file names to the output of the "Join Images Side by Side" tool
*Added "Adjust Lighting" to the Colors menu
*Enhanced the Resize tool so you can resize the image based on pixels or percentage
*Enhanced the Screen Color Picker. Now you can:
*Press Space/+/- key to zoom in/out. Picking a color from an enlarged image is easier
*Specify prefix and suffix to customize the format of RGB, Dec and Hex values
*Enhanced the "Acquire Images from Scanner" tool by allowing you to adjust the colors and lighting of scanned images
*Other improvements and bug fixes

Thanks Han!