OverSite

If you design, develop, or architect Web sites or other GUI-based software applications, then OverSite is the app you've been waiting for, even if you didn't know it. With OverSite, you can quickly define your site or application's structure. Creating wireframe mockups of your pages and screens is also a breeze. You can attach notes to your wireframes to provide further details. OverSite will also auto-generate a map of your site or application, which you can customize to your heart's content.

What is new in this release:

In version 4.0 added ability to group components for easy multi-editing.

Limitations:

Nag screen