Anaconda is the installer for many Linux packages .
Examples of Operating systems which use Anaconda :
1) Red Hat
and many more in the Red Hat bandwagon .
It is developed using C and python,with the graphical front end developed using PyGtk and text front end using newt .
Sample Installer picture :
Useful Links :
1) http://fedoraproject.org/wiki/Anaconda ,for the fedora implementation .
2) http://22.214.171.124/search?q=cache:http://www.pygtk.org/ for more information on PyGTK.
Hope this helped you. You are welcome to comment.