does there exists any sofware to manipulate/view signals/slots in graphical view?

[saugumas]

Define "manipulate". Qt Designer has a connection editor.

but using Designer-qt4 signal/slots editor I can't connect signals to slots outside .ui object, for example I can't even add custom function(slot) to button clicked() signal, I only can add default slots from other widgets.
And it would be very nice to edit signal/slots in graphical view(not by hand code) to all Qt objects(for example QThread, etc), not only .ui objects.