[peter_severin]

WireframeSketcher does this too. This feature is called components and you can share them across screens. You can also override some properties locally, so for example a navigation menu can have a different selection in each screen.

[johnobrien1010]

In addition, WireframeSketcher supports version control systems pretty well. It's the best tool I've seen for wireframing.

[peter_severin]

Thank you for your kind words! We are trying to do our best.