Structure has Been Acquired!
Structure has been acquired by EEHarbor. Head over there for info and support. The documentation will be moving to EEHarbor shortly as well. Read the announcement blog post

Structure is a powerful add-on that lets you create pages, generate navigation, manage content through a simple interface and build robust sites faster than ever. It forgoes the current template_group/template setup and creates “static” and “listing” pages that are all editable through a tree sitemap view. Now, traditional page style content and multiple entry pages can live within the same area. Your clients & authors will rejoice.