Screenshot and Editing on OS X

Question

Looking for a screenshot tool with the following functions

• works on OSX
• start up quickly
• able to take screenshot with hotkey
• able to continuous take screenshot at predefined interval (eg. 1 every 5 sec)
• able to put the screenshots into a default or predefined folder
• able to do basic editing, including
  • define a cropping area that can apply to all screenshots in the folder
  • masking function for sensitive data
  • draw basic boxes, circles, arrows
  • enter text in a textbox
• prefer free/open source
• paid version should be around $20

Answer 1

This Tool came after you have take a screenshot. So you can normaly use the Mac bundled Grab utility and than automatically opened this tool where you can edit the picture. I don't know if this the right one.