Integrated Development Environments (IDEs) for Python:

ActivePython is a Python distribution from ActiveState (http://www.activestate.com).

At its core, it’s the same as the standard Python distribution for Windows. The main difference is that it includes a lot of extra goodies (modules) that are available separately. It’s definitely worth a look if you are running Windows.

Komodo has been made open source, so free versions are also available.
Environment Description Web Site IDLE The standard Python environment

http://www.python.org/idle

Pythonwin Windows-oriented environment http://www.python.org/download/windows

ActivePython Feature-packed; contains Pythonwin IDE

http://www.activestate.com

Komodo Commercial IDE http://www.activestate.com3

Wingware Commercial IDE http://www.wingware.com

BlackAdder Commercial IDE and (Qt) GUI builder http://www.thekompany.com

Boa Constructor Free IDE and GUI builder http://boa-constructor.sf.net
Anjuta Versatile IDE for Linux/UNIX http://anjuta.sf.net
Arachno Python Commercial IDE http://www.python-ide.com
Code Crusader Commercial IDE http://www.newplanetsoftware.com
Code Forge Commercial IDE http://www.codeforge.com
Eclipse Popular, flexible, open source IDE http://www.eclipse.org
eric Free IDE using Qt http://eric-ide.sf.net
KDevelop Cross-language IDE for KDE http://www.kdevelop.org
VisualWx Free GUI builder http://visualwx.altervista.org
wxDesigner Commercial GUI builder http://www.roebling.de
wxGlade Free GUI builder http://wxglade.sf.net