Share Bucket - The best way to capture, edit and share ideas and files on your Mac.
Think of Share Bucket as a place for all your ideas, stored beautifully on the cloud and easily available to those you wish to share with. Share Bucket supports Dropbox, Google Drive, SkyDrive and Imgur.

Awesome Screenshot lets you:
Capture

• Capture or clip selected area, or all visible portion, or a window.
  
• Support PNG format