Use ScreenFloat to keep a reference of almost anything always visible, no matter what application or Space you’re in. Create a screenshot of the relevant portion of your screen with ScreenFloat and it will float above all windows.
Paid • Proprietary
What is ScreenFloat?
Use ScreenFloat to create floating screenshots that are always visible, no matter which application you're in. This way, you don't have to move or resize windows around to keep information visible on your screen.
• Floating Screenshots Screenshots you create with ScreenFloat (by default with the keyboard hotkey cmd-shift-2) immediately open up and are always displayed in front of other windows, following you around, no matter which application, space or fullscreen app you are in. Shots can be changed in size, or in opacity by scrolling up or down within them.
• Shots Browser ScreenFloat keeps your shots around for later reference when you close them. Shots are collected in the Shots Browser where you can name, tag, organize and categorize them.
• Quick and easy export of shots You can send shots created with ScreenFloat to any application that handles image files. A double click onto a floating shot will open it in a default application you can specify for even quicker export.