Jaadoo (iOS & Android) - Search and manage your mobile screenshots, magically
Firefox Send - A file sharing which allows you to send encrypted files to other users.
Infinit - Fast, elegant and unlimited file transfer application (Mac)
ScreenTray - A better way to capture, annotate and share screenshots
snaggy - The Print Screen key is your universal screen capture button. It's located near the top right area of your keyboard, and is sometimes abbreviated to something like “Prt Scr”. You can use it anywhere - you don't need the Snaggy website open.
Glui - glui - GLUI is a GLUT-based C++ user interface library which provides controls such as buttons, checkboxes, radio buttons, and spinners to OpenGL applications. It is window-system independent, using GLUT or FreeGLUT.