Kiwix is an offline reader for Web content. It was designed for use with Wikipedia, but is potentially suitable for all HTML content. It supports the ZIM format, a highly compressed open format with additional meta-data. It is intended for use in schools, universities, and libraries which can't afford broadband Internet access. It features a full text search engine, bookmarks and notes, an HTTP server, PDF/HTML export, a user interface in more than 80 languages, tabbed navigation, and an integrated content manager and downloader.
DeforaOS Surfer is a portable Web browser, supporting tabbed browsing on a number of platforms, including embedded environments. It notably supports either XULRunner (Mozilla), WebKit, libGtkHtml, or its own lightweight implementation as the actual rendering engine to display pages.