I am looking for a Python debugger with the following features:
- Up-to-date - I searched in the web and found debuggers that were last updated in 2009-2010. This is too old and implies that is not supported anymore... 
- Has GUI 
- Is standalone - I don't want to load a whole IDE for debugging some released application 
- Supports Python2.7 and Python 3.x 
Can you recommend me on such a debugger?
EDIT:
From research and from the answers, it seems that there is no debugger that satisfies all the requirements:
- winpdb was last updated in 2009/2010 
- pudb GUI is console based (Like vi editor) - not very convenient and modern 
- Other standalone debuggers have no GUI at all 
- Other debuggers are not standalone, but are a part of IDEs - not convenient for debugging released applications 
If there's an update - I'll write it here...
 
     
    