ShareX, previously with name ZUploader, is a program to capture desired area(s) from your screen and save it or share on different online services or applications.
Can capture full screen, a custom shape (rectangle, triangle, polygon, free hand and many more) or an entire window (application or windows that is active/currently opened).
ShareX lets you to edit image after capture, add text, borders, shadows, add watermark and more.
Files can be saved to hard drive, printed, upload directly to Dropbox, Google Drive and many similar services.
Supports keyboard shortcuts. It includes additional tools such as color picker and hash check.
Can be used for presentations, tutorials or simply to take a snap and save or share that image.