Django-Mechanized is a project mainly written in Python, it's free.
Couple of apps I use often when parsing data from web-sites to be used in django projects.
Django based apps:
browser: Several shortcuts for working with the Mechanize Library See: http://wwwsearch.sourceforge.net/mechanize/
Proxies Shortcuts for finding and using proxies. Use at your own risk.
Source code is documented, please let me know if you run into any issues using either of theses apps.
They complement each other and should be kept together. If there is enough use I will go through and create a proper package for distribution.