We are looking for a patch management tool like RH Satellite or
Novell's ZENworks, but something free and/or open source. With this
tool it should be at least possible to have an overview of all the
managed systems and there state, which patch are available for this or
that system, etc.
I cannot imagine that there does not exist such a tool on Linux,
something rather similar to RH's Satellite... We cannot be the first
who really needs something like that! If yes, I think that we are
going to start a project on Sourceforge !!

I really thank you for you answers and help.