<p>For a new project with Flash I was looking for something along the lines of standard libraries for basic programming needs, along the lines of Python or Ruby standard libraries. But the only thing I found was a dead project on Sourceforge.</p>

<p>Thus is there no standard library for flash? Does everyone reinvent the wheel each time?</p>

The basic libraries are
built into flash
. Then on top of that there is
flex
, which gives you an entire RIA framework. Then there are 3rd party frameworks for
3d
,
physics engines
, various design patterns (
MVC
,
IoC
etc) to name just a few.
So no, you do not not to reinvent the wheel every time.