The bundle contains:

* talesfield
a stringfield like field you store a tales expression in.
it gets evaluated on get and the result is returned.
* pythonfield
a textarea like field where you can store a whole script (python) in.
on get its evaluated and the result is returned.
* dtmlfield and zptfield
both fields working like pythonfield but the given text is evaluated
as dtml or zope page-template.