Wing IDE is a powerful development environment for the Python programming language. It has a code browser, syntax coloring, code completion, call tips, and other code intelligence features. There is also a full-featured editor with optional emacs key bindings and powerful debugging tools. Wing IDE allows you to debug CGI scripts, Python code running under Zope and Plone, embedded Python code, and stand-alone applications. The product comes in two levels, Wing IDE Pro and Wing IDE Personal.
See http://www.wingware.com/products for details
Note: Free licenses for Wing IDE Professional are available for people working on non-commercial open source projects. Details at http://wingware.com/store/prices (in the Discounts section).