PowerMockup is an add-on for PowerPoint 2007/2010 that lets you create wireframes and design mockups for apps and Web sites. It comes with 89 interface elements and 104 wireframe icons, which you can edit and manipulate using PowerPoint's built-in design tools. PowerMockup integrates with PowerPoint by adding a Ribbon tab.
Clicking Show Stencil Library opens a movable/sizeable pane that features various categories of shapes and icons for building your mockups. It offers a speedy search bar at the top and lets you import stencils, create custom categories, and add your own stencils to the library.
Jody Gilbert has been writing and editing technical articles for the past 25 years. She was part of the team that launched TechRepublic and is now senior editor for Tech Pro Research.