Best programs written completly in Python

[Franz Steinhäusler]

Hello NG,

wWhat are the best programs in your opinion, written entirly
in pyhton, divided into categories like:
a) Games
b) Utilities/System
c) Office
d) Web/Newsreader/Mail/Browser
...

I don't want to start a long thread, if a site of such
an discussion already exists, a link will be enough.

Many thanks in advance!

-- 
Franz Steinhaeusler