python test frameworks

[Rustom Mody]

There are a large number of test frameworks in/for python.  Apart from
what comes builtin with python there seems to be nose, staf, qmtest
etc etc.

Is there any central place where these are listed with short descriptions?
'Test framework' means widely different things in different contexts.
Any explanations/tutorials around?

[Disclaimer: I was educated a couple of decades before the TDD rage]