Mountie - Mount a second screen (iPad/iPhone/tablet) to your MacBook
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
Simple Screen Shade - Description and screenshots of Simple Screen Shade.
Luna Display - Hardware that turns the iPad into a wireless second display
Nocturne - Nocturne is simple app for switching a computer to night vision mode.